title: Mongoimport import error - tab delimited CSV detected as JSON
body: <p>I'm trying to import a <code>.csv</code> file into a MongoDB database with the <code>mongoimport</code> utility. The <code>.csv</code> file has a headerline as follows:</p>
  
  <p><code>countryCode    streetName  postalCode  placeName   adminName1  adminCode1  adminName2  adminCode2  adminName3  adminCode3  latitude    longitude   accuracy</code></p>
  
  <p>And the rest of the data is structured as following:</p>
  
  <p><code>GB Broad Street    AB10 1AA    George St/Harbour Ward  Scotland    SCT         Aberdeen City   S12000033   57.1482280891232    -2.09664786079318   6</code></p>
  
  <p>I get the following error when using the command:</p>
  
  <p><code>mongoimport -d mydb -c locations --file geodata.csv --headerline
  error validating settings: can not use --headerline when input type is JSON</code></p>
  
  <p>Can anyone tell me why? The <code>csv</code> file only has 130,000 records so it's not a size issue.</p>