As an alternate, you can this SQL command in the Scheduled Job, which does the neat job.

backup log xxxx to disk = 'd:\dumpdev\yyyy.trn' with init

xxxx = Name of the Database,...

Hello

Instead of using 'Maintenance Cleanup Task', use 'Execute T-SQL Statement Task' and key in the following SQL commands. This should fix the error. This is an work around.

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declare...