When you get this error, your first action should be to look up the function in the include files to see what arguments you need:
Code:
/* Get user model.
*/
native cs_get_user_model(index, model[], len);
In this case, it needs three arguments. The model string will be populated with the model and 'len' is the maximum length of the string variable that you use for 'model'.
The other thing is that in Pawn, you can't (or shouldn't; I can't remember which) compare strings by using equal signs. Use the equal() or equali() function.
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