ClockFailure on run

I'm currently using a Sinara chassis and attempting to run the (very basic) script below:

from artiq import *
from artiq.experiment import *

class LED(EnvExperiment):
    def build(self):
        self.setattr_device("core")
        self.setattr_device("ttl4")

    @kernel
    def run(self):
        self.core.reset()
        self.ttl4.on()

But running this both through the dashboard and artiq_run I'm receiving the error "artiq.coredevice.exceptions.ClockFailure" whenever I attempt to run anything on the core, and the error extends to attempting to activate any TTL / set any DDS through the dashboard. The documentation says this indicates the RTIO phase-locked loop losing lock but I couldn't find any resources to address it. Thank you!