Generally - errors in SSMS creating or modifying maintenance plans can be tracked back to mismatched versions. There are some known issues where you have to re-register the DTS component, but the error you are getting doesn't indicate that.
If your version of SSMS is a lower version than the system you are connecting to - it is likely that is causing the error you are seeing.
Jeffrey Williams
“We are all faced with a series of great opportunities brilliantly disguised as impossible situations.”
― Charles R. Swindoll
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Managing Transaction Logs