https://forums.autodesk.com/t5/net-forum/system-missingmethodexception/m-p/6061958#M36988 <P>Im attempting to generate a library .dll that contains common functions for tools being developed for our office use.</P><P>&nbsp;</P><P>Im testing with VS Express 2012 &amp; AutoCAD 2016.&nbsp; Sometimes I will get the "System.MissingMethodException" for a valid call made to the library .dll</P><P>&nbsp;</P><P>I was wondering why its intermittent.&nbsp; My library dll is referenced by the loaded .net module and is definately being loaded by AutoCAD because windows prevents it from being deleted.</P><P>&nbsp;</P><P>Many thanks.</P><P>&nbsp;</P><P>All works fine in AutoCAD 2014... Ive swapped out the Ref dlls for AutoCAD2016 and still get the error.&nbsp; Odd different behaviour...</P> Mon, 29 Feb 2016 17:10:34 GMT StormyC 2016-02-29T17:10:34Z https://forums.autodesk.com/t5/net-forum/system-missingmethodexception/m-p/6061958#M36988 <P>Im attempting to generate a library .dll that contains common functions for tools being developed for our office use.</P><P>&nbsp;</P><P>Im testing with VS Express 2012 &amp; AutoCAD 2016.&nbsp; Sometimes I will get the "System.MissingMethodException" for a valid call made to the library .dll</P><P>&nbsp;</P><P>I was wondering why its intermittent.&nbsp; My library dll is referenced by the loaded .net module and is definately being loaded by AutoCAD because windows prevents it from being deleted.</P><P>&nbsp;</P><P>Many thanks.</P><P>&nbsp;</P><P>All works fine in AutoCAD 2014... Ive swapped out the Ref dlls for AutoCAD2016 and still get the error.&nbsp; Odd different behaviour...</P> Mon, 29 Feb 2016 17:10:34 GMT https://forums.autodesk.com/t5/net-forum/system-missingmethodexception/m-p/6061958#M36988 StormyC 2016-02-29T17:10:34Z https://forums.autodesk.com/t5/net-forum/system-missingmethodexception/m-p/6062024#M36989 <P>Ok found my problem...</P><P>&nbsp;</P><P>I hadn't updated the Ref Dlls in the library .dll.</P><P>&nbsp;</P><P>I&nbsp;now need for AutoCAD2016 an explicit conversion for LispDataType to int which is why the Method signature wasnt being found.</P><P>&nbsp;</P><P>Still doesnt really explain the intermittent nature of the error though.....</P> Mon, 29 Feb 2016 17:32:07 GMT https://forums.autodesk.com/t5/net-forum/system-missingmethodexception/m-p/6062024#M36989 StormyC 2016-02-29T17:32:07Z