Encountered a duplicate function parameter.

#2021 Compile-time error

Encountered a duplicate function parameter.

Additional Information

In function 'X', for parameter Y 'Z'.
or
In function 'X', parameter 'Y' was already declared as type 'Z'.

Recovery

Compilation continues but no compiled source code file will be saved.

Explanation

Each parameter identifier (the shelf type and its name) may appear only once in the parameter list for a given function.