ATEasy is unable to load a DLL error when I start my ATEasy application

Knowledge Base Article # Q200082

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Summary How to troubleshoot why ATEasy is unable to load a DLL.
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ATEasy 6.x and above uses LoadLibraryEx Windows Application Programming Interface (API) function at run time to load the DLLs you described in the ATEasy module (program, system or driver). The function returns a details status which ATEasy displays when it fails. The error will show as "Unable to Load the '%1' DLL file '%2'. Windows API LoadLibraryEx returned error # %3 (0x%4): %5". Prior version of ATEasy returned the error "Unable to load the '%1' DLL file '%2' Error %3 (0x%4): %5".

Here are a list of possible causes and solution to this problem in case the error description (%5) is "The specified DLL or a referenced DLL could not be found" (error #127/0x7F) or "the specified module could not be found" (error #127/0x7F) or "the specified procedure could not be found"  (error #126/0x7E):
  • Check the DLL library file path and make sure the DLL exist. You can check this from ATEasy DLL Properties. The property page display if the file exist or not, if the file exist it will show the exact location where the DLL file name will be used at run-time.  If you are using relative (i.e. or no path name in the DLL path in ATEasy you need to make sure the DLL will be located in a folder found relative to the EXE file name as displayed in the Project property page. If you are not using a path in the file name (i.e. kernel32.dll) using no You may have several DLLs of the same name make sure the DLL on the disk is the one you think is loaded - Try to temporary change the DLL Library path in ATEasy to a full path name instead of relative path or no path. This procdure is used usally for error # 127 or  0x7F.
  • The DLL you are using may depends on other DLLs. You can download a tool called DEPENDS.EXE from to see what DLLs are used by the DLL you are trying to load. After you download it, run the program and open the DLL you are trying to load from the DEPENDS file menu and it will show a list of DLLs that are used by your DLL. If it's missing it will show it in red the DLL that is missing.  This procdure is used usally for error # 126 or  0x7E.
  • Some DLLs will have initialization code that is called when they are loaded. This code may fail. Follow the DLL manufacturer instruction for setup and preparation before using it or contact the manufacturer for support.
Article Date 12/15/2006
Keywords ATEasy, DLL, Library

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