I'm not familiar with that VBO but my guess is that it contains code stages and a reference to that DLL file. The reference is telling BP to find the DLL on the local machine and the error is saying that BP can't find it.
Potential reasons for this could be - the file is not on the machine, the file is on the machine but not on the specified path, the path has not been specified and BP cannot find the file in the 'usual' locations (meaning the BP install folder or folders in the Windows PATH variable).