The syntax for 'X' is incorrect.

A DAX parse error near the named token.

Why it happens

• A missing or extra comma or parenthesis.
• The wrong argument separator for your regional settings (some locales use a semicolon).
• Using = where a comparison = inside a predicate was meant, or a stray operator.

How to fix it

1. Check that brackets and parentheses balance, and the function's argument count matches its signature.
2. Run the formula through a DAX formatter to localise the separators and reveal the break.
3. In non-US locales, confirm whether the list separator is , or ;.