undefined symbol error while 'import cudaq_solvers as solvers'.

[Amogh1506]

I get below error at 'import cudaq_solvers as solvers'.I have pip installed cudaq_solvers in python.

Error:
lib/libcudaq-python-interop.so: undefined symbol: _ZN5cudaq17get_qu............

[boschmitt]

Hello @Amogh1506. Thank you for submitting this issue, we're glad to see you are using the library!

Can you post the full output and details about your environment? It would be important to know whether you are using the docker image or not, and which operating system (linux distribution you are using).

[Amogh1506]

@boschmitt

full error:

ImportError: /home/xxxx_ubuntu/miniconda3/envs/cuda-quantum/lib/python3.10/site-packages/cudaq_solvers/../lib/libcudaq-python-interop.so: undefined symbol: _ZN5cudaq17get_quake_by_nameERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESt8optionalIS5_E

uname -r
5.15.167.4-microsoft-standard-WSL2

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.4 LTS

[bmhowe23]

Hi @Amogh1506 - I am wondering if you have a 0.8.0 version of the cuda-quantum wheel installed in your environment. (CUDA-QX requires version 0.9.0.) Would it be possible to run pip list | grep cuda-quantum, and if you see cuda-quantum 0.8.0 in there, could you please do the following?

1. pip uninstall cuda-quantum
2. pip install --upgrade --force-reinstall cudaq

A little bit of backstory: the top-level CUDA-Q wheel name changed from cuda-quantum to cudaq in 0.9. Normally it would be impossible to have two versions of a given wheel installed in the exact same environment, but due to the name change, I have been able to reproduce your error by having both cuda-quantum==0.8.0 and cudaq==0.9.0 installed, so the instructions above attempt to remedy that by removing the old one and reinstalling the new one.