Invalid seed

#1

Hello, I participated in the investment of blcokstack in the coinlist and submitted the wallet address. When I created the wallet, I saved the seed and logged in to the wallet with the seed. The last time I logged in the wallet was in the first quarter of 2019. But today I log in to the wallet again and prompt me that the seed is invalid. What should I do? Please help me, thank you very much.

#2

Please email [email protected] for more help.