After Update 8.1.1

[webcreatif]

Hello,

add sub domain

ERROR: PleskMainDBException
MySQL query failed: MySQL server has gone away

Additionally, an exception has occurred while trying to report this error: PleskMainDBException
MySQL query failed: MySQL server has gone away

0: /usr/local/psa/admin/plib/common_func.php3:211
db_query(string 'select id id, displayName name, cl_id parent_id from domains where id in (4)')
1: /usr/local/psa/admin/plib/CachedResolver.php:143
CachedResolver->findParentsOfIds(array)
2: /usr/local/psa/admin/plib/CompatibilityUIPointer.php:108
CompatibilityUIPointer->importSessionParams(NULL null, boolean false)
3: /usr/local/psa/admin/plib/CompatibilityUIPointer.php:120
CompatibilityUIPointer->importSessionParams(NULL null, boolean false)
4: /usr/local/psa/admin/plib/CompatibilityUIPointer.php:120
CompatibilityUIPointer->importSessionParams(NULL null, boolean true)
5: /usr/local/psa/admin/plib/CompatibilityUIPointer.php:120
CompatibilityUIPointer->importSessionParams()
6: /usr/local/psa/admin/plib/UIPointer.php:766
UIPointer::getCurrent()
7: /usr/local/psa/admin/plib/common_func.php3:3791
wizard_dispatch_next(integer '4511')
8: /usr/local/psa/admin/htdocs/domains/subdomains/subdom_edit.php:101

Thanks for you help