Error in 'eval' command: The expression is malformed. Expected )

This is my search query REST API call : curl -k -u admin:password https://api.splunk.ext.com/services/search/jobs/export -d search="search index=cpaws source=PFT buildNumber=17 type=REQUEST | stats p98(wholeduration) as current| appendcols [search index=cpaws source=PFT buildNumber=16 type=REQUEST | stats p98(wholeduration) as n] | appendcols [search index=cpaws source=PFT buildNumber=15 type=REQUEST | stats p98(wholeduration) as m] | eval previousVal=(n+m)/2 | eval success=if(previousVal*0.1 <= (current),\"Good\",\"BAD\")| table current,n,m,previousVal,success" -d earliest_time=-80h@h -d latest_time=now I am getting this error 0 Error in 'eval' command: The expression is malformed. Expected ). Please help me out for this. Thanks