Website crashed says theme missing

[kamalren 0]

Warning: array_keys() [function.array-keys]: The first argument should be an array in /home5/waikatoi/public_html/wp-includes/theme.php on line 519 Warning: uksort() [function.uksort]: The argument should be an array in /home5/waikatoi/public_html/wp-admin/includes/class-wp-themes-list-table.php on line 49 Warning: array_slice() expects parameter 1 to be array, boolean given in /home5/waikatoi/public_html/wp-admin/includes/class-wp-themes-list-table.php on line 56 I am getting these notices I can't figure out what has happend please help. The theme has gone missing. It is just not showing in wordpress.

[Kate 3]

Hello Harkanwal, Is your theme still showing in wp-content/themes? Also, what led up to this error? Did you move the site or make any other changes? Is the default TwentyTen theme showing up? If so, please try activating that instead, at least for the time being. Once you check wp-content/themes, if you no longer see the theme, you may need to re-upload it.