Switch language mode from SAS to Python in VSC got error 'Request textDocument/foldingRange failed.'

[Zhirong2022]

Describe the bug
Open VSC SAS Extension base on Main branch. Create a .sas file, change language mode from SAS to Python. Type some python code, it will has error 'Request textDocument/foldingRange failed.'.

Steps to reproduce
There are no any python relative extensions installed

1. Create a .sas file
2. Switch language mode from SAS to Python
3. Type code below

print('test')

Expected behavior
No error

Screenshots

Environment (please complete the following information):
Client OS: [e.g. Windows 11]
Extension version: [e.g. v1.12.0]