SYNTAX_ERROR
What happened
The file is not valid Python, or is not text in UTF-8. Nothing else can be checked until it is.
What to do
Fix the syntax at the line the message names. The message is Python's own.
Example
text
strategy.py, line 3: invalid syntax [SYNTAX_ERROR]The wording of the message depends on your file, and the code does not. An error stops the file from loading.