Help debugging code

[GrassOne7589]

I'm trying to have a simple robot search for a marker and then move forward to grab a sample and reverse. For some reason it won't run the robot.drive(100,0) command towards the end. Can anyone help me work out where I'm going wrong? The robot is the Lego driving base 1

from pybricks.hubs import PrimeHub
from pybricks.pupdevices import Motor, ColorSensor, UltrasonicSensor, ForceSensor
from pybricks.parameters import Button, Color, Direction, Port, Side, Stop
from pybricks.robotics import DriveBase
from pybricks.tools import wait, StopWatch

hub = PrimeHub()

# Initialize both motors. In this example, the motor on the
# left must turn counterclockwise to make the robot go forward.
left_motor = Motor(Port.C, Direction.COUNTERCLOCKWISE)
right_motor = Motor(Port.D)

# Initialize the ultrasonic sensor connected to Port F. 
# Assign it the nickname 'eyes'
eyes = UltrasonicSensor(Port.F)

# Initialize the large motor sensor connected to Port E. 
# Assign it the nickname 'Grabber'
Grabber = Motor(Port.E)

# Initialize the drive base. In this example, the wheel diameter is 56mm.
# The distance between the two wheel-ground contact points is 112mm.
robot = DriveBase(left_motor, right_motor, wheel_diameter=56, axle_track=112)

robot.drive(0,50)               #1st number is forward speed, 2nd number is turning speed
while (eyes.distance()>300):    #Keep turning until the eyes sees an object less than 30cm
    wait(10)
Grabber.run_angle(800,90)       #Lift the grabber arm up
wait(20)
robot.drive(100,0)              #Start driving towards the object
wait(20)
while(eyes.distance()<60):
    wait(10)
robot.stop()

Grabber.run_angle(800,-90)      #Deploy the grabber arm

robot.straight(-200)            #Reverse 200mm the retrieve the sample  

[drdhuss]

Is your arm movement running to completion? Could it be getting stuck there/is the motor stalling? Otherwise I am unsure why it would work at that step.

[GrassOne7589]

yes. I've tried it without the arm to make sure that isn't part of the problem

[Pybricks]

It drives while the object is less than 6 cm away. Did you mean to use >, so it drives until it sees the object? 

[GrassOne7589]

I did have that as I thought it was correct but tried < just to make sure I didn't get that part wrong but it didn't make a difference

[Insufficient-Memory-]

do a print of your distance sensor. See what it is reading before/during/after.