warning fix

diff --git a/CRM/Report/Form/ActivitySummary.php b/CRM/Report/Form/ActivitySummary.php
index 57a9e7908303b14c8472d39f2b916a214b192c6e..07b502830e5e7dab07d9da0e865f5a0bb523859d 100644 (file)
--- a/CRM/Report/Form/ActivitySummary.php
+++ b/CRM/Report/Form/ActivitySummary.php
@@ -434,7 +434,7 @@ class CRM_Report_Form_ActivitySummary extends CRM_Report_Form {
    *
    * @return array
    */
-  public function formRule($fields, $files, $self) {
+  public static function formRule($fields, $files, $self) {
     $errors = array();
     $contactFields = array('sort_name', 'email', 'phone');
     if (!empty($fields['group_bys'])) {