Error 33. The identifier is already in use. You attempted to assign value to the identifier representing a function. If you want to return value from function you should use RETURN statement instead.

Example 1:

function Test( x )
{
   return 2 * x;
}

VarSet( "Test", 7 ); // error, identifier 'Test' is already used for function

Example 2:

(incorrect)

function Test( x )
{
 Test = 2 * x; // error here because Test identifier is already used for function,
 // you should use return statement to return values from function
}

x = Test(5);

Correct function returning value would look like this:

function Test( x )
{
    return 2 * x; // correct, returning values using return statement
}

x = Test(5);