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Almost every URG-04LX-UG01 that I've seen enumerates as /dev/ttyACM0 (or ACM1, ACM2, etc). Are you absolutely certain that your port setting is correct? Do you have the serial version of the lidar instead of the USB version?

The error timeout reached suggests that there isn't any data coming in on that port, or something else is reading that data first. You should be able to check which programs have that port open with sudo lsof | grep /dev/ttyUSB0. If there are any other programs using that port, you should figure out why and disable them.