Hello. I got an error "Send failed. Status for ajaxSendPost is 500" while trying to change the cost of shiping in the order. I also found in error.log file of web-server the folowing erorr:

PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 261900 bytes) in ****/www/html/libraries/loader.php on line 366, referer: *****/administrator/index.php?option=com...ditOrder&cid=135

Could you please help with this?