MathType has detected an error inULibCls.Error running

Today I am typing math paper for school class children. For math symbols I use math type software after writing symbols in this software I move these symbols in Microsoft Word file.
Before 2 days this is working properly for me but today I try then I receive given error. Tell me solution.
Â
Microsoft Word
MathType has detected an error inULibCls.Error running
Cmd = NoDirectCall-InsertRightNumberedDispEqn mod = UILibCls in
RunMTDLL Command. Please save your document and report this error to Design Science Technical Support.
                                                                                   OK
