sympy error Object reference

[Electrowolf2]

Hi Exodrifter

Before starting this thread I would like to thank you for the work you have done with this because I really liked it a lot. my problem is the following: use the following code and it runs perfectly without any problem.

using System.Collections;
using System.Collections.Generic;
using IronPython.Hosting;
using Microsoft.Scripting.Hosting;
using UnityEngine;
public class Derivadas_trigonometricas : MonoBehaviour
{
    public TEXDraw TD;
    string ejercicio;
    public void Trigonometricas()
    {
        var engine = Python.CreateEngine();
        ICollection<string> searchPaths = engine.GetSearchPaths();
        searchPaths.Add(@"D:\Proyectos_Unity\Math_EMax\Assets\Python\Lib");
        engine.SetSearchPaths(searchPaths);
        var scope = engine.CreateScope();

        string codigo = @"from random import randint, choice

coef = randint(-10,10)
op_func_trig = [r'\sin(x)', r'\cos(x)', r'\tan(x)']
func_trig = choice(op_func_trig)

while coef == 0:
    coef = randint(-10, 10)

if coef == 1:
    coef = ''

if coef == -1:
    coef = '-'

ejercicio = str(coef) + str(func_trig)";

        var recurso = engine.CreateScriptSourceFromString(codigo);

        recurso.Execute(scope);

        ejercicio = scope.GetVariable<string>("ejercicio");

        TD.m_Text = ejercicio;
        TD.SetTextDirty();
    }
}

making another script that has the same structure (in fact the idea of ​​doing it that way is that I can put any program made in python and run it)

using System.Collections;
using System.Collections.Generic;
using IronPython.Hosting;
using Microsoft.Scripting.Hosting;
using UnityEngine;
public class sympy_test : MonoBehaviour
{
    public TEXDraw TD;
    string ejercicio;
    public void sympytest()
    {
        var engine = IronPython.Hosting.Python.CreateEngine();
        ICollection<string> searchPaths = engine.GetSearchPaths();
        searchPaths.Add(Application.dataPath + @"\Python" + @"\Lib\");
        searchPaths.Add(Application.dataPath + @"\Python" + @"\Lib" + @"\sympy\");
        searchPaths.Add(Application.dataPath + @"\Python" + @"\Lib" + @"\mpmath\");
        engine.SetSearchPaths(searchPaths);
        
        var scope = engine.CreateScope();

        string codigo = "from sympy import *\n";
        codigo += "x = symbols('x')\n";
        codigo += "f = x**2\n";
        codigo += "ejercicio = str(f)\n";

        var recurso = engine.CreateScriptSourceFromString(codigo);

        recurso.Execute(scope);

        //ejercicio = scope.GetVariable<string>("ejercicio");

        //TD.m_Text = ejercicio;
        //TD.SetTextDirty();
    }
}

but it gives me an error on line 28, which is when it is executed

recurso.Execute(scope);

ther error is:
NullReferenceException: Object reference not set to an instance of an object
Microsoft.Scripting.Runtime.LightExceptions.CheckAndThrow (System.Object value) (at :0)

the large version of this error is here (if it helps):

NullReferenceException: Object reference not set to an instance of an object
Microsoft.Scripting.Runtime.LightExceptions.CheckAndThrow (System.Object value) (at :0)
Microsoft.Scripting.Interpreter.FuncCallInstruction2[T0,TRet].Run (Microsoft.Scripting.Interpreter.InterpretedFrame frame) (at <adbce494b74f4c8787535955fc342591>:0) Microsoft.Scripting.Interpreter.Interpreter.HandleException (Microsoft.Scripting.Interpreter.InterpretedFrame frame, System.Exception exception) (at <adbce494b74f4c8787535955fc342591>:0) Microsoft.Scripting.Interpreter.Interpreter.Run (Microsoft.Scripting.Interpreter.InterpretedFrame frame) (at <adbce494b74f4c8787535955fc342591>:0) Microsoft.Scripting.Interpreter.LightLambda.Run1[T0,TRet] (T0 arg0) (at <adbce494b74f4c8787535955fc342591>:0) IronPython.Compiler.RuntimeScriptCode.InvokeTarget (Microsoft.Scripting.Runtime.Scope scope) (at <264a665625104e3c9b8ba1905cf1b515>:0) IronPython.Compiler.RuntimeScriptCode.Run (Microsoft.Scripting.Runtime.Scope scope) (at <264a665625104e3c9b8ba1905cf1b515>:0) IronPython.Runtime.PythonContext.InitializeModule (System.String fileName, IronPython.Runtime.ModuleContext moduleContext, Microsoft.Scripting.ScriptCode scriptCode, IronPython.Runtime.ModuleOptions options) (at <264a665625104e3c9b8ba1905cf1b515>:0) IronPython.Runtime.PythonContext.CompileModule (System.String fileName, System.String moduleName, Microsoft.Scripting.SourceUnit sourceCode, IronPython.Runtime.ModuleOptions options, Microsoft.Scripting.ScriptCode& scriptCode) (at <264a665625104e3c9b8ba1905cf1b515>:0) IronPython.Runtime.PythonContext.CompileModule (System.String fileName, System.String moduleName, Microsoft.Scripting.SourceUnit sourceCode, IronPython.Runtime.ModuleOptions options) (at <264a665625104e3c9b8ba1905cf1b515>:0) IronPython.Runtime.Importer.LoadFromSourceUnit (IronPython.Runtime.CodeContext context, Microsoft.Scripting.SourceUnit sourceCode, System.String name, System.String path) (at <264a665625104e3c9b8ba1905cf1b515>:0) IronPython.Runtime.Importer.LoadModuleFromSource (IronPython.Runtime.CodeContext context, System.String name, System.String path) (at <264a665625104e3c9b8ba1905cf1b515>:0) IronPython.Runtime.Importer.LoadPackageFromSource (IronPython.Runtime.CodeContext context, System.String name, System.String path) (at <264a665625104e3c9b8ba1905cf1b515>:0) IronPython.Runtime.Importer.LoadFromDisk (IronPython.Runtime.CodeContext context, System.String name, System.String fullName, System.String str) (at <264a665625104e3c9b8ba1905cf1b515>:0) IronPython.Runtime.Importer.ImportFromPathHook (IronPython.Runtime.CodeContext context, System.String name, System.String fullName, IronPython.Runtime.List path, System.Func5[T1,T2,T3,T4,TResult] defaultLoader) (at <264a665625104e3c9b8ba1905cf1b515>:0)
IronPython.Runtime.Importer.ImportFromPath (IronPython.Runtime.CodeContext context, System.String name, System.String fullName, IronPython.Runtime.List path) (at <264a665625104e3c9b8ba1905cf1b515>:0)
IronPython.Runtime.Importer.ImportTopAbsolute (IronPython.Runtime.CodeContext context, System.String name) (at <264a665625104e3c9b8ba1905cf1b515>:0)
IronPython.Runtime.Importer.ImportModule (IronPython.Runtime.CodeContext context, System.Object globals, System.String modName, System.Boolean bottom, System.Int32 level) (at <264a665625104e3c9b8ba1905cf1b515>:0)
IronPython.Modules.Builtin.import (IronPython.Runtime.CodeContext context, System.String name, System.Object globals, System.Object locals, System.Object fromlist, System.Int32 level) (at <264a665625104e3c9b8ba1905cf1b515>:0)
Microsoft.Scripting.Interpreter.FuncCallInstruction7[T0,T1,T2,T3,T4,T5,TRet].Run (Microsoft.Scripting.Interpreter.InterpretedFrame frame) (at <adbce494b74f4c8787535955fc342591>:0) Microsoft.Scripting.Interpreter.Interpreter.Run (Microsoft.Scripting.Interpreter.InterpretedFrame frame) (at <adbce494b74f4c8787535955fc342591>:0) Microsoft.Scripting.Interpreter.LightLambda.Run7[T0,T1,T2,T3,T4,T5,T6,TRet] (T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6) (at <adbce494b74f4c8787535955fc342591>:0) System.Dynamic.UpdateDelegates.UpdateAndExecute6[T0,T1,T2,T3,T4,T5,TRet] (System.Runtime.CompilerServices.CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5) (at <351e49e2a5bf4fd6beabb458ce2255f3>:0) IronPython.Runtime.Importer.ImportLightThrow (IronPython.Runtime.CodeContext context, System.String fullName, IronPython.Runtime.PythonTuple from, System.Int32 level) (at <264a665625104e3c9b8ba1905cf1b515>:0) IronPython.Runtime.Importer.Import (IronPython.Runtime.CodeContext context, System.String fullName, IronPython.Runtime.PythonTuple from, System.Int32 level) (at <264a665625104e3c9b8ba1905cf1b515>:0) IronPython.Runtime.Operations.PythonOps.ImportStar (IronPython.Runtime.CodeContext context, System.String fullName, System.Int32 level) (at <264a665625104e3c9b8ba1905cf1b515>:0) Microsoft.Scripting.Interpreter.ActionCallInstruction3[T0,T1,T2].Run (Microsoft.Scripting.Interpreter.InterpretedFrame frame) (at :0)
Microsoft.Scripting.Interpreter.Interpreter.Run (Microsoft.Scripting.Interpreter.InterpretedFrame frame) (at :0)
Microsoft.Scripting.Interpreter.LightLambda.Run2[T0,T1,TRet] (T0 arg0, T1 arg1) (at :0)
IronPython.Compiler.PythonScriptCode.RunWorker (IronPython.Runtime.CodeContext ctx) (at <264a665625104e3c9b8ba1905cf1b515>:0)
IronPython.Compiler.PythonScriptCode.Run (Microsoft.Scripting.Runtime.Scope scope) (at <264a665625104e3c9b8ba1905cf1b515>:0)
IronPython.Compiler.RuntimeScriptCode.InvokeTarget (Microsoft.Scripting.Runtime.Scope scope) (at <264a665625104e3c9b8ba1905cf1b515>:0)
IronPython.Compiler.RuntimeScriptCode.Run (Microsoft.Scripting.Runtime.Scope scope) (at <264a665625104e3c9b8ba1905cf1b515>:0)
Microsoft.Scripting.SourceUnit.Execute (Microsoft.Scripting.Runtime.Scope scope, Microsoft.Scripting.ErrorSink errorSink) (at <96bae61c64314af5927380c0b6bd16cf>:0)
Microsoft.Scripting.SourceUnit.Execute (Microsoft.Scripting.Runtime.Scope scope) (at <96bae61c64314af5927380c0b6bd16cf>:0)
Microsoft.Scripting.Hosting.ScriptSource.Execute (Microsoft.Scripting.Hosting.ScriptScope scope) (at <96bae61c64314af5927380c0b6bd16cf>:0)
sympy_test.sympytest () (at Assets/Scripts/sympy_test.cs:28)
UnityEngine.Events.InvokableCall.Invoke () (at :0)
UnityEngine.Events.UnityEvent.Invoke () (at :0)
UnityEngine.UI.Button.Press () (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/UI/Core/Button.cs:68)
UnityEngine.UI.Button.OnPointerClick (UnityEngine.EventSystems.PointerEventData eventData) (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/UI/Core/Button.cs:110)
UnityEngine.EventSystems.ExecuteEvents.Execute (UnityEngine.EventSystems.IPointerClickHandler handler, UnityEngine.EventSystems.BaseEventData eventData) (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/EventSystem/ExecuteEvents.cs:50)
UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/EventSystem/ExecuteEvents.cs:262)
UnityEngine.EventSystems.EventSystem:Update() (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/EventSystem/EventSystem.cs:385)

I reiterate my gratitude for the help and I would still like to know if you have any publication of this work since the objective of the development of this software is a publication and I must mention you within it.

[Electrowolf2]

Hello again

I was playing with the codes of the files that I mentioned in the previous post and it seems that the problem is generated when I try to import sympy. In the file that runs without any problem, I put the line to import sympy and I get the same problem as the code that doesn't run, so I think that's where the detail goes but I still can't find the answers, I hope to find it soon, in advance I appreciate your help again.