While trying to open AECOsim Building Designer, the program is failing with the below shown error.
This problem is caused by a missing or incorrect Microsoft windows registry entry for the Dynamic link Library Fm20.dll. The proper registration of this file is required when you work with UserForms.
To resolve this problem, register Fm20.dll. You must have Regsvr32.exe to register Fm20.dll. If you don not have Regsvr32.exe you can download the file. For additional information, please see the following article in the Microsoft Knowledge Base:161983 Regsv32a.exe Available in Download Center
To register Fm20.dll, kindly follow these steps:
The file Fm20.dll should be registered correctly. then you will see that you wont get the error message again.