Restart your computer or reinstall Windows.

>Still,
>
>Declare DLL caused an exception
>
>:-(
>
>>I don't understand why you need the FindWindow call. Try this simplified version. It works fine on my machine.
>>If it works, you need to change the hardcoded URL.
>>
>>

>>tcUrl = IIF(type("tcUrl")="C",tcUrl,"https://www.vfphelp.com/vfp9/index.htm")
>>tcAction = IIF(type("tcAction")="C",tcAction,"Open")
>>IF type("Application.StartMode") = "N" AND !inlist(Application.StartMode,2,3,5)
>>  *  UI only when not being called from a COM server
>>  WAIT WINDOW "Loading " + tcURL + " ..." NOWAIT
>>ENDIF
>>DECLARE INTEGER ShellExecute IN SHELL32.dll ;
>>     INTEGER nWinHandle, ;
>>     STRING cOperation, ;
>>     STRING cFileName, ;
>>     STRING cParameters, ;
>>     STRING cDirectory, ;
>>     INTEGER nShowWindow
>>RETURN ShellExecute(0,tcAction,tcUrl,"",'',1)

>>
>>>Hi Tore
>>>
>>>this line
>>>
>>>RETURN ShellExecute(FindWindow(0,_Screen.Caption),tcAction,tcUrl,"",SYS(2023),1)
>>>
>>>>>Hello all,
>>>>>
>>>>>I will have a button on form. When the user clicks that button I want to launch where the user can make it's payment.
>>>>>
>>>>>My app is on WIndows Server 2016.
>>>>>
>>>>>So far someone gave me this code
>>>>>
>>>>>

>>>>>lParameters tcURL, tcAction
>>>>>tcUrl = IIF(type("tcUrl")="C",tcUrl,"https://square.link/u/HereCodeForThePersonWhowillBePaid")
>>>>>tcAction = IIF(type("tcAction")="C",tcAction,"Open")
>>>>>IF type("Application.StartMode") = "N" AND !inlist(Application.StartMode,2,3,5)
>>>>>  *  UI only when not being called from a COM server
>>>>>  WAIT WINDOW "Loading " + tcURL + " ..." NOWAIT
>>>>>ENDIF
>>>>>DECLARE INTEGER ShellExecute IN SHELL32.dll ;
>>>>>     INTEGER nWinHandle, ;
>>>>>     STRING cOperation, ;
>>>>>     STRING cFileName, ;
>>>>>     STRING cParameters, ;
>>>>>     STRING cDirectory, ;
>>>>>     INTEGER nShowWindow
>>>>>DECLARE INTEGER FindWindow IN WIN32API ;
>>>>>     STRING cNull, ;
>>>>>     STRING cWinName
>>>>>RETURN ShellExecute(FindWindow(0,_Screen.Caption),tcAction,tcUrl,"",SYS(2023),1)
>>>>>

>>>>>
>>>>>First time I executed that code I received this : Declare DLL caused an exception
>>>>>Second time I executed my VFP session froze.
>>>>>
>>>>>Suggestion?
>>>>>
>>>>>Regards
>>>>
>>>>Which line gave the error?