Mysql lxc proxmox container cant import mysql

[Madifor1972]

Trying to import an exported Mysql database , when i try to upload it i get the following error message:
HTTP/1.0 500 Perl execution failed
Server: MiniServ
Date: Tue, 5 Mar 2024 12:55:32 GMT
Content-type: text/html; Charset=utf-8
Connection: close

ERROR — PERL EXECUTION FAILED

failed to write to /tmp/.webmin/661686_3451_3_exec_file.cgi : Bad file descriptor

Anybody an idea how to resolve this ?