rename: src should be string....

I know this is likely a very stupid question - so thanks in advance if someone could help.

I am getting the following error:
TypeError Traceback (most recent call last)
In [49]:
Line 138: renameFile(currentAttachmentPath, newAttachmentPath)

In [49]:
Line 47: os.rename(currentAttachmentPath, newAttachmentPath)

TypeError: rename: src should be string, bytes or os.PathLike, not list

I think this is a case of just not understanding where the string pathways should be inserted.