I am using Office 2013 to develop macros which are used in project 2013 professional and Office 2013. The files I'm editing (xxx.docm and xxx.xlam) were both created and edited with Office 2010. Since installing Office 2013 and saving the docm file (and saving it as being .dotm afterwards), the next error is spawned upon opening it with Word 2010:

I would gladly post the included code, but it doesn't appear to matter here, because this error shuts all of the functions and subs from the .dotm file. I can not execute anything of it.

Is that this a general Office 2013 and cheap office 2010 professional plus error brought on by some type of conversion? How can I reverse this or how can I prevent such conversions?