When setting the "input side" of the XP bottler in the new GUI, I get the following exception: http://pastebin.com/6eCkwx8T

Relevant versions:
OpenBlocks: 1.1.0-forge9.11.0.883-snapshot-0 (built from commit 40b028b)
OpenPeripheral: 0.2.1-preview8
Forge: 9.11.1.916

Steps to reproduce:

• Place XP Bottler
• Place Vacuum Hopper to the left
• Adjust Vacuum Hopper to output XP to XP Bottler
• Place Vanilla Hopper above XP Bottler
• Place Empty Glass Bottles in Vanilla Hopper
• Try to set empty bottle input side on XP Bottler

Should be fixed now