FPC message: Wrong number of parameters specified
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Missing parameter or too many parameters
You confused the function and forgot a parameter or added a parameter too much.
Missing @
For example:
Button1.Click := Button1Click;
In mode ObjFPC you must add the @ to tell the compiler, that you want the pointer to the function, not the result of the function:
Button1.Click := @Button1Click;
Delphi users often confuse this, because Delphi allows it and adds the @ internally. If you prefer the Delphi syntax you can use {$mode Delphi} instead of {$mode ObjFPC}.