Semantic Error (SEM1160): A variable with the same name like method '...' does already exist.

A variable and a method with the same name are defined in a user-defined FB. In the local variables grid, the declaration of the affected variable is marked red.

Remedy

Double-click the error message to jump to the affected variable declaration.
Rename either the method or the variable. If the variable is already in use, you can perform a refactoring.