pt-table-checksum error:I need a vals argument at /usr/bin/pt-table-checksum line

I run pt-table-checksum as this: pt-table-checksum h=‘192.168.1.6’,u=‘checksums’,p=‘checksums’,P=3306 --nocheck-replication-filters --no-check-binlog-format --replicate=test.checksums.
and I got this:Error checksumming table xxx.yyyyy: I need a vals argument at /usr/bin/pt-table-checksum line 8620.

then print the last line:12-17T14:25:23 1 0 0 0 0 0.005 …

I wonder to know if pt-table-checksum run completely?
what’s this error mean? and should I fix something?
thanks for answer me!

what version of pt-table-checksum you are using ? Check this bug report https://bugs.launchpad.net/percona-toolkit/+bug/1182180

percona-toolkit-2.2.2

know it. thank you!