@AnupS724 Can you check the logs/tracer for any other errors? Also can you please let us know if this happens only with DT? Please check if there is any other version of this DT in branch that is in your checkout? Please check the privileges as well
Faced the similar issue, We wanted to delete the rule, when tried performing checkout got the same error, it got resolved by unchecking the Use checkout? checkbox in ruleset, save the rule and then delete.