db2 9.7.0.0删除实例注册信息报错

db2创建实例不完全创建，需要清除注册信息，进行删除实例，在执行db2greg命令时报错：Error encountered during the Delete record action: Failed to lock the registry，请教是什么问题？./db2greg -delservrec service=DB2,version=9.7.0.0,installpath=/opt/IBM/db2/V9.7
./db2greg -delinstrec service=DB2,version=9.7.0.0,instancename=xxx,
instancepath=/xxx/sqllib