First of all can you please check what kind of fibre cable and sfp module do you use ? Something like single mode or multimode.? If wrong can you please fix and check again?
Apart from that error message could be due to one of the following;
Bad fiber or Bad transceiver module
As an another action plan;
1-) You can replace the fiber link all over the path .
2-) You can try to replace the transceiver module on both side .
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