Google.GoogleApiRequestException: Google.Apis.Requests.RequestError Backend Error [500] Errors [Message[Backend Error] Location[ - ] Reason[backendError] Domain[global] ] ---> System.Net.WebException: The remote server returned an error: (500) Internal Server Error.

private static GaData executeDataQueryForCustomDimension(Analytics analytics, String profileId,Map reqMap)  {
      GaData gaData = new GaData();
      String startDate = (String) reqMap.get("fromDate");
      String toDate = (String) reqMap.get("toDate");
    try {
        gaData = analytics.data().ga().get("ga:" + profileId, // Table Id.
                startDate, // Start date.2015-01-01
                toDate, // End date.2015-07-07
            "ga:visits") // Metrics.
            .setDimensions("ga:pagePath")
          .setMetrics("ga:timeOnPage")
          .setFilters("ga:pagePath!~^/[-a-zA-Z0-9]+/[-a-zA-Z0-9]+/;ga:pagePath!@login;ga:pagePath!@admin;ga:pagePath!@.com;ga:pagePath!@p_p_id;ga:pagePath!@?;ga:pagePath!@blog;ga:pagePath!@add-review;ga:pagePath!@.html;ga:pagePath!@manufacturer/;ga:pagePath!@product-evaluations;ga:pagePath!@product;ga:pagePath!@request-more-info;ga:pagePath!@video/;ga:pagePath!@categories/")
            .setStartIndex(1)
          .setMaxResults(40000)
            .execute();
    } catch (Exception e) {
        e.printStackTrace();
        logger.error("Error getting data",e.getMessage());
    }

      return gaData;
  }