What kind of error is this? (I attached image)

[AdministratorAGOL_ODIMM]

#error1000 survey123 web

Error appear when survey is filling by users. The form is public.

[JamesTedrick · Accepted solution]

Hi Igor,

The issue is likely caused by the text being submitted being too long (Troubleshoot—Survey123 for ArcGIS | ArcGIS ).  When authored from the web, the single line text question can accept a maximum of 255 characters.  If you expect responses longer than that, use the multiline text can accept 1000 characters.  

Surveys published with Survey123Connect can be configured with user-defined character limits.

[AdministratorAGOL_ODIMM]

Thanks James for your answer.