解决方法：

Index: t3lib/class.t3lib_timetracknull.php
===================================================================
— t3lib/class.t3lib_timetracknull.php    (revision 6604)
+++ t3lib/class.t3lib_timetracknull.php    (working copy)
@@ -129,10 +129,16 @@
* @param    float        $microtime: The microtime value – if not set the current time is used
* @return    integer        The microtime value as milliseconds value
*/
–    public function getMilliseconds($microtime = NULL) {}
+    public function getMilliseconds($microtime = NULL) {
+        if (!isset($microtime)) {
+            $microtime = microtime(true);
+        }
+        return round($microtime * 1000);
+    }

}

// XCLASSing is not possible for this class

-?>
\ No newline at end of file
+?>