New ItemType, Error

Hi everyone... When i create a instance of ItemType shows an error like below....  "Conversion from type 'DBNull' to type 'String' is not valid" What is this ? I can't understand.   Thank you, Regards, Sathishkumar C.
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  • I have added two lifecycles in ItemType. I remove one lifcycle. In workflow Tab I checked "Default". Now Create a instance of ItemType it shows an error. "ConverAras.Server.Core.ItemIsLockedException". If i unchecked the "Default" on workflow Tab, I can create an instance of ItemType but It does not trigger the workflow.  
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  • I have added two lifecycles in ItemType. I remove one lifcycle. In workflow Tab I checked "Default". Now Create a instance of ItemType it shows an error. "ConverAras.Server.Core.ItemIsLockedException". If i unchecked the "Default" on workflow Tab, I can create an instance of ItemType but It does not trigger the workflow.  
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