Looks like you are missing the ) bracket.
It should be
Formula=(getPidValue(5)*7.718)/getPidValue(7))
Also it would be good to provide the log file located at /home/pi/.openauto/cache/openauto.log to troubleshoot the issue.
It should be
Formula=(getPidValue(5)*7.718)/getPidValue(7))
Also it would be good to provide the log file located at /home/pi/.openauto/cache/openauto.log to troubleshoot the issue.