Hey welcome to the Fuel forum @sonalbiswas336,
How much ETH are you trying to bridge from the Fuel network to Sepolia? It seems the issue you’re encountering may be related to insufficient ETH in the bridging contract to fulfill your request.
As this was our initial launch of the bridge, we didn’t fully anticipate the overwhelming interest and number of testers from our community. For the next iteration, we plan to allocate a substantially larger amount of testnet ETH. We appreciate your engagement and support. Thank you for being a part of this journey! 
