Error in workflow map default selection

whenever a workflow is checked as default inside an item the flowing error is popped up. How to solve this.

My second question is I have created a workflow map but when an object created under an item type. The workflow map should show an assignment under the assigned person inbasket but it is not happening for me. What could be the possible reason?

-<SOAP-ENV:Envelope>
-<SOAP-ENV:Body>
-<SOAP-ENV:Fault>
 <faultcode>SOAP-ENV:Server.ItemIsLockedException</faultcode>
 <faultstring>Aras.Server.Core.ItemIsLockedException</faultstring>
-<detail>
 <af:legacy_detail>Aras.Server.Core.ItemIsLockedException</af:legacy_detail>
 <af:exception message =" Aras.Server.Core.ItemIsLockedException " type =" Aras.Server.Core.ItemIsLockedException " />
 <af:item type =" Practice " id =" BAFF726B423E488AACCD265BB0A5CBF4 " />
 </detail>
 </SOAP-ENV:Fault>
 </SOAP-ENV:Body>
 </SOAP-ENV:Envelope>

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