It is hard to find the cause of this error when when attach a lifecycle to an object.
The cause can be anything.
Aa far as I know,
1. change the implement method of lifecyle from docbasic to Java method.
2. file store permission setting
It turns out that any kind of execution failure related to state transition can lead to this error message.
BTW, the detailed message is :
[DM_POLICY_E_EXIST_NO_BP_LOG]error: “BP Log (/path_to_dba/log/repo_id/bp/bp_transition_some_id.out) was not created.”
A commonly recommended solution for this error is to clear the dmcl cache on Content Server and bounce it.