RiftomeR crashing on login

[RiftomeR]

Member Name
RiftomeR

Minecraft Username
RiftomeR

Server
Beyond

What were you doing last time you managed to be on the server? (if you have never joined, say so)
Placed many windows from architecturecraft(They were useless).

Crash Report
pastebin.com/Me8ymthN

When did you first experience this crashing?
Yesterday. .