Maybe this has been addressed already but I can’t seem to find the solution.
Reduce the retraction maybe? 
Simply reducing retraction is not the answer. Some of the start gcodes for the J1 in those slicers are retracting to much as seen below. Change that to E-1 wherever that pops up in the starting code to fix it for myself.
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Starting from v1.4 SMFix has already addressed this issue and works well with PrusaSlicer/OrcaSlicer for gcode file repairs.
However, I suggest using sm2up, as it does not require any modifications to the post-processing script of your prints. Simply set your physical printer to OctoPrint mode.
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I have the same issue, same screenshot on the console.
I’m using CURA and retraction distance is set to 2 mm, by default it was 6 mm. Furthermore, I knew of this issue before slicing, so I have put 2 mm. But I still see the message on the console.
The only thing that look like retraction is this at the end:
;— End G-code Begin —
M104 S0
M140 S0
G92 E0
G1 E-2 F3000 ;Retract the filament
G92 E0
G28 Z
G28 X0 Y0
M84
;— End G-code End —
And this in the start:
;— Start G-code End —
G92 E0
G92 E0
G1 F1500 E-2
Any ideas ?
I am not the most familiar with Cura. But another setting that would cause the error for me was the retraction amount on tool change. Even if it was a single extruder print. Looks like in Cura that is called “Nozzle switch retraction distance”. Perhaps checking that could help. I don’t have the J1 setup in Cura to see what that setting is currently myself.
I will open a case with Snapmaker (147473)