The same thing happened to me, but I solved in the cpanel, editing the php.ini and .htaccess file, matching
.htaccess
<IfModule php7_module>
php_value max_execution_time 30
php_value max_input_time 60
php_value max_input_vars 1000
php_value memory_limit 128M
php_value post_max_size 64M
php_value session.gc_maxlifetime 1440
php_value upload_max_filesize 64M
</IfModule>
<IfModule lsapi_module>
php_value max_execution_time 30
php_value max_input_time 60
php_value max_input_vars 1000
php_value memory_limit 128M
php_value post_max_size 64M
php_value session.gc_maxlifetime 1440
php_value upload_max_filesize 64M
</IfModule>
php.ini
max_input_vars = 1000
límite de memoria = 128M
post_max_size = 64M
session.gc_maxlifetime = 1440
session.save_path = “/ tmp”
upload_max_filesize = 64M
