expected primary-expression before'return'

This error message typically indicates that there is a syntax error in the code, specifically related to the use of the 'return' keyword.

There are a few possible reasons why this error message might appear:

- The 'return' keyword may be used in an incorrect context, such as outside of a function definition, or within a conditional or loop statement.
- There may be a missing or misplaced punctuation mark, such as a missing semicolon or parentheses, that is causing the code to be interpreted incorrectly.
- There may be a typo or other mistake in the code that is causing the compiler to interpret it incorrectly.

To resolve this error, you will need to carefully review the code and ensure that all instances of the 'return' keyword are being used correctly and in the appropriate context. You may also need to double-check for any syntax errors or typos.