Why can't I set my ticket to solved?

Question Why can't I change my ticket status to solved? I need to solve the customer ticket, but one of the following error messages appears:

"Ticket field name" needed


Assignee is required when solving a ticket

Answer You can't solve a ticket unless the ticket has:
An Assignee

All mandatory fields contain a value
To solve this behavior:
Refresh the page
Verify these two elements
Try again

Note: The error message lengthens if more required fields are left blank. For a similar issue, see: The Solved button is grayed out on my messaging ticket.
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Why can't I set my ticket to solved? Why can't I change my ticket status to solved? Why can't I solve the customer ticket? Why does the error message "Assignee is required when solving a ticket" appear?
You cannot solve a ticket unless the ticket has an **Assignee** or agent or support person or team member, and all mandatory fields or data boxes contain a value. To solve this issue, refresh the page, verify these two elements, and try again. The error message or "Ticket field name" needed message lengthens if more required fields remain blank.

