Class ArgumentDoesNotExist

Please suggest, what is the meaning of below error & why we are receiving below multiple error related to the sites which has been removed or unsubscribed from the console.

And how to stop receiving this if these are not a problem & if problem do we need to open a PMR.

At 4/17/2017 3:27:34 AM
in site "Unknown External Site (11203)"
in file "IBMSoftwareInventory.BESDomain"
in filter
in relevance “set of wizards whose(dashboard id of it is “SUA_Portal.ojo” or dashboard id of it is “SwKBT_Portal.ojo”) of current bes site”

class ArgumentDoesNotExist