Hey Kazimierz,

Hm, this is the first time I have seen such an error and from the looks of it, after the quick registration is completed, it actually works because I did receive the e-mail of successful sign up.

I believe those errors could be coming from a 3rd party plugin but to be able to pin point which plugin it is, is it possible that you provide us with your FTP access please?

I have updated post and add information about FTP,
I think problem can be in MightySites component, but not sure. i have disabled it for EasySocial component but problem is still actual.

Hey Kazimierz,

I am really sorry for the delay of this reply as it is a weekend for us here. After testing this, it looks like the problem is coming from the plugin "Smart Search - Geek ElasticSearch". It is throwing the following errors:

Fatal error: Uncaught Elasticsearch\Common\Exceptions\Missing404Exception: {"found":false,"_index":"database","_type":"EasySocialUsers","_id":"744","_version":1,"result":"not_found","_shards":{"total":2,"successful":1,"failed":0}} in /home1/t1x9m4f3/community.ecomolfa.com/administrator/components/com_geekelasticsearch/libraries/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/Connection.php:564 Stack trace: #0 /home1/t1x9m4f3/community.ecomolfa.com/administrator/components/com_geekelasticsearch/libraries/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/Connection.php(262): Elasticsearch\Connections\Connection->process4xxError(Array, Array, Array) #1 /home1/t1x9m4f3/community.ecomolfa.com/administrator/components/com_geekelasticsearch/libraries/vendor/react/promise/src/FulfilledPromise.php(25): Elasticsearch\Connections\Connection->Elasticsearch\Connections\{closure}(Array) #2 /home1/t1x9m4f3/community.ecomolfa.com/administrator/components/com_geekelasticsearch/libraries/vendor/guzzlehttp/ri in /home1/t1x9m4f3/community.ecomolfa.com/administrator/components/com_geekelasticsearch/libraries/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/Connection.php on line 564

I have disabled the plugin and it seems to be working fine now.

Thank you for your researching, yes you are right, couse was in Geek ElasticSearch.
I have disable this component for easy social, and now all work correctly.

Thank you.

You are most welcome