[BUG] holoscan.core has no attribute MultiMessageConditionInfo

[kavmar]

Hi

while trying to run any app from examples, I get the error:

File "/path/to/my/app/.venv/lib/python3.12/site-packages/monai/deploy/core/init.py", line 32, in
from holoscan.core import *
AttributeError: module 'holoscan.core' has no attribute 'MultiMessageConditionInfo'

OS/Platform: Ubuntu 24
Python Version: 3.12
Method of MONAI Deploy App SDK install: pip
SDK Version: 2.0.0
holoscan version: 2.8.0

Commenting out "MultiMessageConditionInfo" in
.venv/lib/python3.12/site-packages/holoscan/core/init.py" on the line 162 helped to continue, but I think it would be better to solve it in a clean way.

Thanks

[grlee77]

Hi @kavmar, there is unfortunately a missing import in the holoscan/core/__init__.py in the v2.8 release of Holoscan that causes this issue.

This will be fixed in the next Holoscan release, but in the meantime you can patch the installed __init__.py file as described below:

You should be able to find the location of the installed __init__.py using:

python -c "import holoscan.core; print(holoscan.core.__file__)"

Edit that file, adding the following line to the imports in that file:

from ._core import MultiMessageConditionInfo

@MMelQin: I think you have recent experience patching this issue for Deploy App SDK? Do you have any additional/alternative recommendation?

[kavmar]

python -c "import holoscan.core; print(holoscan.core.__file__)"

Edit that file, adding the following line to the imports in that file:

from ._core import MultiMessageConditionInfo

@MMelQin: I think you have recent experience patching this issue for Deploy App SDK? Do you have any additional/alternative recommendation?

Thanks a lot @grlee77 , adding the import worked.

[MMelQin]

Sorry for the late response, and thank you all for the inputs. (I was heads-down working on an important demo for JP Morgan Healthcare Conference).

Yes, as @grlee77 mentioned, the issues and workarounds were known, and sorry for not posting such info in the repo Discussion/Issues earlier. For sure will do better when Holoscan v2.8 is released.