Python library ZOHO_IMPORT_TYPE error

Python library ZOHO_IMPORT_TYPE error

Hi,
I get the error
com.adventnet.zoho.client.report.python.ReportClient.ServerError: u'ZOHO_IMPORT_TYPE is not present in the request parameters list'

My code:

def importData(self,rc,uri):
   
        try:
            with open('biexporttozoho.csv', 'r') as f:
                importContent = f.read()
        except Exception,e:
            print "Error Check if file biexporttozoho.csv exists in the current directory!! "
            print "(" + str(e) + ")"
            return
        impResult = rc.importData(uri,"TRUNCATEADD",importContent,None)
        print "Added Rows :" +str(impResult.successRowCount) + " and Columns :" + str(impResult.selectedColCount)


Can anyone help me please?
Thanks.