error MIDL2020 : error generating type library : SaveAllChanges Failed

If you get an error while importing IDL into COM (dll) by midl command.
check;
-dll file is not read only
-dll file is not used by other aopplications
-Each GUI should not obtain { or } in IDL file.

Good Lucks...
P.S:Please do not hesitate to share your comments.

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