is this normal?

cc.mint thread 9, elapsed time 24 seconds, Transaction not allowed or invalid
cc.mint thread 2, elapsed time 24 seconds, Transaction not allowed or invalid
cc.mint thread 1, elapsed time 24 seconds, Transaction not allowed or invalid
cc.mint thread 4, elapsed time 25 seconds, Transaction not allowed or invalid
cc.mint thread 3, elapsed time 27 seconds, Transaction not allowed or invalid

thank you!