inbound queue SMQ2 error like Command to tRFC/qRFC: Execute LUW again

Hi All,

when I execute smq2 t.code in abap stack... some queues showing error status as ""Command to tRFC/qRFC: Execute LUW again"".

How do I have to clear the queues when this type of error occurred in smq2.

Anyone give the frequently coming errors in smq2 and solution to clear the queues