Either a bad SFP or fiber would be the logical assumptions.
Appears to be in the SWMYCJNEO-02 transmit to the SLMYCJNEO-02 receive direction. Check the light levels on either side with the "sh int Gx/x/x transceiver detail" if available.
1- Replace fiber jumpers on one side then the next.
2- Replace the SFP on the SWMYCJNEO-02 side.
3- Replace the SFP on the SLMYCJNEO-02 side.
4- Test the infrastructure fibers between switches and / or move to a new pair.
Hope this helps