https://community.graphisoft.com/t5/Archicad-C-API/Add-on-problem/m-p/251294#M2004 Hi,<BR /> <BR /> Does your Add-On have any external dependencies? Using any other 3rd party libraries (DLL) etc.<BR /> If yes, then those must be placed next to Archicad.exe.<BR /> <BR /> Please make sure you publish the Release version of your Add-On!<BR /> If you accidently publish the Debug version then this can happen... Tue, 16 Mar 2021 17:28:08 GMT Tibor Lorantfy 2021-03-16T17:28:08Z https://community.graphisoft.com/t5/Archicad-C-API/Add-on-problem/m-p/251293#M2003 <DIV class="actalk-migrated-content">Hi, I develop a add-on. And it works in my Archicad 21. I ensure that I use visaul studio 2015 and MDID of my add-on is right. But it cannot be used in ArchiCAD 21 of other people.<BR />Problem reason is in the following picture.<IMG border="0" /><S><IMG src="&lt;/s&gt;&lt;e&gt;" border="0" /></S><BR />THANKS!</DIV> Tue, 14 Sep 2021 07:54:08 GMT https://community.graphisoft.com/t5/Archicad-C-API/Add-on-problem/m-p/251293#M2003 Anonymous 2021-09-14T07:54:08Z https://community.graphisoft.com/t5/Archicad-C-API/Add-on-problem/m-p/251294#M2004 Hi,<BR /> <BR /> Does your Add-On have any external dependencies? Using any other 3rd party libraries (DLL) etc.<BR /> If yes, then those must be placed next to Archicad.exe.<BR /> <BR /> Please make sure you publish the Release version of your Add-On!<BR /> If you accidently publish the Debug version then this can happen... Tue, 16 Mar 2021 17:28:08 GMT https://community.graphisoft.com/t5/Archicad-C-API/Add-on-problem/m-p/251294#M2004 Tibor Lorantfy 2021-03-16T17:28:08Z https://community.graphisoft.com/t5/Archicad-C-API/Add-on-problem/m-p/251295#M2005 Thanks, I check two cases. I use dlls and copy them in Archicad folder. and I ues release version, but add-on cannot be used in other computer. I feel confused. Thu, 18 Mar 2021 09:47:58 GMT https://community.graphisoft.com/t5/Archicad-C-API/Add-on-problem/m-p/251295#M2005 Anonymous 2021-03-18T09:47:58Z