Change to Sites/all/modules/custom/parser_eventrss/includes/eventrsssimplepieparser.inc

gistfile1.aw

<?php  



public function parse(FeedsImportBatch $batch, FeedsSource $source) {

    $result = parent::parse(&$batch, $source);

/*-----------------------------------------------------------------------------
became....
-----------------------------------------------------------------------------*/

  public function parse(FeedsImportBatch &$batch, FeedsSource $source) {

    $result = parent::parse($batch, $source);