I am sure you have installed a GBIC in a Cisco switch that was not manufactured by Cisco. and your switch no doubt shut down the SFP port and gave the following error
%PHY-4-UNSUPPORTED_TRANSCEIVER: Unsupported transceiver found in Gi1/0/0
%GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65538 has bad crc
well here is how we fix that issue
login into the CLI of the switch
enable your session
and enter into config mode using the config t command
now enter the following 2 commands
service unsupported-transceiver
no errdisable detect cause gbic-invalid
your 3rd party gbic should now work properly.
remember to save you configuration.