fastboot: error: Failed to identify current slot when tring to flash

Cant get to isntall eOS on my Oneplus 6 fastboot_ error_ failed to identify current slot failure error message is displayed when you attempt to commit the configuration detect any errors that may occur Backing Up the Current Configuration fastboot change slot Proceed with the instructions on screen 4 If you are unable to locate or find the Service Tag, click the Product Category of your computer 5 Choose the

fastboot get active slot  Read-only The current status of the FRU object in the slot fruObjectNum 5 - Error status 6