SQL SERVER – Maintenance Plan – Could not load type ‘Microsoft.SqlServer.Dts. Runtime.Wrapper. IDTSPackageSigning100’ from Assembly

One of my client was unable to modify the maintenance plan using SSMS. When we did various tests, we found that existing maintenance plans could execute and work. We tried creating a new maintenance plan and found it to be working. So, our issue is confined to “unable to modify existing plans”. Here is the error message

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