More information needed.
1) What type of object is "osms" and what dll is it declared in? With a property like "VeryLittleToVerBig" I guess it's one that you wrote.
2) If it's your dll then are you trying to merge the source in the exe or are you using it as a dll?
3) If you are trying to merge the source then try removing the source from the Libraries folder and compile with the dll in the project folder. Does that work?