Error on print start need help

Basic Information:

Printer Model: Ender 3 Max
MCU / Printerboard: Creality 4.2.7

Fill out above information and in all cases attach your klippy.log file (use zip to compress it, if too big). Pasting your printer.cfg is not needed
Be sure to check our “Knowledge Base” Category first. Most relevant items, e.g. error messages, are covered there

Describe your issue:

…Just finised up a print and went to go print the next one and get the following from the klippy.log. Using creality sonic pad, have had no issues until this. Tried the following already.

Delete and reinstall the klipper to mcu from creality sonic pad.
Delete any macros in printer.cfg file and no change
Still prints on another printer connected to same creality sonic pad
Changed directory of saved gcode file to print and same issue.

[ERROR] 2024-03-24 16:59:39,479 [root] [virtual_sdcard:_load_file:416] File opened:Ender3Max/CE3PRO_friendly_slug_curled_up.gcode Size:118194254 start_print
[ERROR] 2024-03-24 16:59:41,571 [root] [klippy:run:246] Unhandled exception during run
Traceback (most recent call last):
File “/usr/share/klipper/klippy/”, line 243, in run
File “/usr/share/klipper/klippy/”, line 292, in run
File “/usr/share/klipper/klippy/”, line 340, in _dispatch_loop
timeout = self._check_timers(eventtime, busy)
File “/usr/share/klipper/klippy/”, line 158, in _check_timers
t.waketime = waketime = t.callback(eventtime)
File “/usr/share/klipper/klippy/extras/”, line 909, in work_handler
File “/usr/share/klipper/klippy/extras/”, line 239, in recordPrintFileName
result = (json.loads(
File “/usr/lib/python3.7/json/”, line 348, in loads
return _default_decoder.decode(s)
File “/usr/lib/python3.7/json/”, line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File “/usr/lib/python3.7/json/”, line 355, in raw_decode
raise JSONDecodeError(“Expecting value”, s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
[ERROR] 2024-03-24 16:59:41,575 [root] [klippy:invoke_shutdown:351] Transition to shutdown state: Unhandled exception during run
klippy.log (3.7 MB)

The Creality Sonic Pad isn’t supported here because Creality is using their own modified version of Klipper that violates the Klipper license. You’ll need to ask Creality for help supporting the product they sold you.

So if i get out my raspberry pi and hook it up and do the same thing and it fails will I get a solution to my issue?

If you get the same error from a clean installation of unmodified Klipper, then you are much more likely to find someone who is able to help you, since in that case, people will either be familiar with, or able to look at, the code that is producing the error.

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