HELP ME PLEASE IM DESPERATE

Please i neee help , i've been doing the quest "krusty-est place on the earth " part 13. and i started to build SLEEPING ITCHYS CASTLE" but meanwhile krustyland nuking thanks to update, and the building was conpleted but where ??? in left panel is that quest is complete but it ist button to "go on"
so building is complete but nowhere
does anybody know what to do ???