Specified key was too long; max key length is 767 bytes

Hello everybody, 

i converted the DB from utf8 to utf8mb4 in my local server and i imported the DB to my hosting (godaddy hosting) i got this message: Specified key was too long; max key length is 767 bytes

i can't access to my.cnf or my.ini files

is there any other solution ? maybe i need to edit something in the database !!!