cannot load library

Answered

Matteo Giachero

• March 18, 2024 08:25

After I installed Gurobi and got my license, I tried to run a simple modelling program on pycharm. Once i run the program I get this unexpected error: 
OSError: cannot load library 'C:\gurobi1101\win64\bin\gurobi110.dll': error 0xc1

Related to

• PyCharm
• Installation

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• 

  Gurobot (AI-generated response)

  Gurobi Staff

  • March 18, 2024 21:45

  The error you're facing is often due to a mismatch in the version or architecture (32-bit vs 64-bit) of Python and Gurobi, or a missing DLL file. Here's a brief guide to resolve it:

  1. Check Gurobi Installation: Ensure the DLL file exists at 'C:\gurobi1101\win64\bin\gurobi110.dll'. If not, reinstall Gurobi.

  2. Match Python Architecture: Verify both Python and Gurobi are either 32-bit or 64-bit. Use python -c "import platform; print(platform.architecture())" to check Python's architecture.

  3. Set Environment Variables: Add Gurobi's bin directory to the PATH environment variable, so your system can locate the Gurobi DLLs.

  4. IDE Configuration: If using an IDE like PyCharm, ensure it's set to use the Python interpreter where Gurobi is installed.

  5. Virtual Environments: If you're using one, activate it and confirm Gurobi is installed there.

  6. Gurobi and Python Compatibility: Ensure your Gurobi version is compatible with your Python version.

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• 

  Riley Clement

  Gurobi Staff

  • March 18, 2024 22:31

  Further to Gurobot's last point please see Which Python versions are supported by Gurobi?
  
  Once you have your license setup you shouldn't actually need a Gurobi installation (such as C:\gurobi1101\) to work with Gurobi in Python.  Gurobipy is a self contained package.

  - Riley

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