Help failure of fiber retraction

[sima35]

-use for 2 colors
-It comes out of the extruder without any problems.
-the tube is easy to pass through
-it pulls out about 3 cm above the extruder

[T0] < En <<<<<.... [Ex ... Nz] -102.0mm (e:49.9mm)
20:44
Attempting to recover filament position...
20:44
Parking toolhead at (x:50.0, y:50.0, z:5.2) for pause operation
20:44
idle_timeout: Timeout set to 72000.00 s
20:44
After fixing, call RESUME to continue printing (MMU_UNLOCK to restore temperature)
20:44
MMU issue detected. Print will be paused
Reason: Unload sequence failed: Bowden pre-unload test failed. Filament seems to be stuck in the extruder or filament not loaded.
Occured when changing tool: T0 > T1

Can someone help me?