Nothing happens when I press the button

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In clarion 6.x, the report source must be "from memory". See Report Design (Local Extension).
In clarion 5.5, the report have to use a file that needs at least one record in it. If you pick an empty file, nothing will print.
You have to declare the report procedure that will print the window. See Report to call.
Check to see if you accidentally activated the Disable code generation option.