VS-GW2120 FATAL ERROR while sending SMS

Good day I'm having problems with my VS-GW2120 while sending about 4,952 SMS this error occurs:

Fatal error: Uncaught exception 'Predis\Response\ServerException' with message 'ERR command not allowed when used memory > 'maxmemory'' in /tmp/web/www/cgi-bin/inc/predis/src/Client.php:367 Stack trace: #0 /tmp/web/www/cgi-bin/inc/predis/src/Client.php(332): Predis\Client->onErrorResponse(Object(Predis\Command\ListPushTail), Object(Predis\Response\Error)) #1 /tmp/web/www/cgi-bin/inc/predis/src/Client.php(312): Predis\Client->executeCommand(Object(Predis\Command\ListPushTail)) #2 /tmp/web/www/cgi-bin/php/sms-sender.php(543): Predis\Client->__call('rpush', Array) #3 /tmp/web/www/cgi-bin/php/sms-sender.php(543): Predis\Client->rpush('app.asterisk.ph...', '{"uuid":"22808f...') #4 {main} thrown in /tmp/web/www/cgi-bin/inc/predis/src/Client.php on line 367

It seems to be the memory; how can I add or free memory?

¿Any help?
I'll be so thankful

Hi sir.
Here is holiday from Jan 31 – February 10, 2019 in observance of Chinese New Year. Your understanding will be highly appreciated if our holidays bring any inconveniences
and you can try clean memory in SYSTEM-INFOMATION. or you can try factory reset.

could you fix the error? I have same problem

Hi sir,
please add my skype This email address is being protected from spambots. You need JavaScript enabled to view it.
i will help you check