I don't know how to read mysql, but does this have something to do with my menus?

We are several users, with macs and computers, and whenever someone is logged on to piwigo (called datenbank on our server)
it is impossible for anyone else to even see the startpage. Also, when for instance I want to look at the tag "Bergen" and then from that add the tag "water"
it also happens. This message comes up all the time.


[mysql error 126] Incorrect key file for table '/tmp/#sql_52b_1.MYI'; try to repair it
SELECT i.id as image_id, i.file as image_file, i.comment, i.path, i.tn_ext, c.id as catid, c.name, c.permalink, RAND() as rndvalue, i.name as imgname
            FROM piwigo_categories c, piwigo_images i, piwigo_image_category ic
            WHERE c.id = ic.category_id
              AND ic.image_id = i.id
              AND i.level <= 0  AND c.id NOT IN (0)  ORDER BY rndvalue
            LIMIT 0,1

#1    my_error /share/MD0_DATA/Qweb/datenbank/include/dblayer/functions_mysql.inc.php(82)
#2    pwg_query /share/MD0_DATA/Qweb/datenbank/plugins/AMenuManager/amm_pip.class.inc.php(270)
#3    AMM_PIP::ajax_amm_get_random_picture /share/MD0_DATA/Qweb/datenbank/plugins/AMenuManager/amm_pip.class.inc.php(82)
#4    AMM_PIP::blockmanager_apply ()
#5    call_user_func_array /share/MD0_DATA/Qweb/datenbank/include/functions_plugins.inc.php(181)
#6    trigger_action /share/MD0_DATA/Qweb/datenbank/include/block.class.php(137)
#7    BlockManager::apply /share/MD0_DATA/Qweb/datenbank/include/menubar.inc.php(325)
#8    initialize_menu /share/MD0_DATA/Qweb/datenbank/include/menubar.inc.php(31)
#9    include /share/MD0_DATA/Qweb/datenbank/index.php(264)


Could it be that the server is to weak (Qnap 209 pro)? Or a timeout issue?

Im anyway lost, and dont know how to fix this.

Birtles