Hello everyone,

I am currently trying to generate a bilayer membrane for a protein that forms a protein-protein complex after docking. I am using Charmm-gui, and unfortunately, I am encountering the following error during the protein-membrane construction step:

```

OPNLGU> Unit 99 cannot be opened as STEP4_COMPONENTS.STR

* LEVEL 0 WARNING FROM *

* "OPEN" not possible

```

Could anyone provide guidance on why this error is occurring and how I can resolve it?

Thank you for your assistance.

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