title: Error 400 "Selected dimensions and metrics cannot be queried together."
body: <p>I tried to get the following query results but got error 400 "Selected dimensions and metrics cannot be queried together."  I checked the dimensions and metrics reference guide but cannot find any clue.  Please advise.</p>
  
  <p><b>metrics:</b> ga:hits <br>
  <b>dimensions: </b>ga:dateHour,ga:minute,ga:eventAction,ga:sourceMedium,ga:eventCategory,ga:previousPagePath,ga:pagePath <br>
  <b>filters:</b> ga:eventCategory=~^test</p>