Please enter a valid user name in the system profile option Business Rule Monitor Workflow Administr

When we try to start workflow monitor, system gives below error

APP-JTF-210566: Unable to start Business Rule Monitor.
Please enter a valid user name in the system profile option Business Rule Monitor Workflow Administrator.
This user should have a Workflow role defined for them.
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3205: 'BRM workflow administrator' is not a valid role or user name.
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Wf_Engine.SetItemAttrText(JTFBRM, 10185, WF_ADMINISTRATOR, BRM workflow administrator)
JTF_BRM_PVT.INIT_MONITOR()