Can't get current from PDP, crashes.

[Aero]

Hey guys, I'm experiencing a lil bit of trouble with the PDP's CAN stuff.
I'm trying to make our compressor disable once we're drawing a certain amount of amperage, just cause that current allowance could be better used.

For some reason, calling the PDP's getTotalCurrent method is causing our robot to crash with a "CTRE CAN Recieve Timeout"

Here's the code and full error:

from wpilib import Compressor, PowerDistributionPanel

class Pneumatics(object):
	AMPERAGE_THRESHOLD = 20

	def __init__(self):
		self.comp = Compressor()
		self.pdp = PowerDistributionPanel()

	def update(self):
		"""
		Monitors the PDP for amp draw, and disables the compressor if amp draw is above a threshold to prevent brownouts.
		:return:
		"""
		if self.pdp.getTotalCurrent() > self.AMPERAGE_THRESHOLD:
			self.comp.stop()
		else:
			self.comp.start()

ERROR Unhandled exception:
Traceback (most recent call last):
  File "/home/lvuser/py/robot.py", line 110, in <module>
    run(Drake)
  File "/usr/local/lib/python3.4/site-packages/wpilib/_impl/main.py", line 100, in run
    retval = options.cmdobj.run(options, robot_class, **kwargs)
  File "/usr/local/lib/python3.4/site-packages/hal/main.py", line 11, in run
    return robot_class.main(robot_class)
  File "/usr/local/lib/python3.4/site-packages/wpilib/robotbase.py", line 185, in main
    robot.startCompetition()
  File "/usr/local/lib/python3.4/site-packages/wpilib/samplerobot.py", line 162, in startCompetition
    self.operatorControl()
  File "/home/lvuser/py/robot.py", line 95, in operatorControl
    self.update()
  File "/home/lvuser/py/robot.py", line 102, in update
    component.update()
  File "/home/lvuser/py/components/pneumatics.py", line 16, in update
    if self.pdp.getTotalCurrent() > self.AMPERAGE_THRESHOLD:
  File "/usr/local/lib/python3.4/site-packages/wpilib/powerdistributionpanel.py", line 56, in getTotalCurrent
    return hal.getPDPTotalCurrent()
  File "/usr/local/lib/python3.4/site-packages/hal/functions.py", line 40, in outer
    raise HALError(getHALErrorMessage(status.value))
hal.exceptions.HALError: CTRE CAN Recieve Timeout