HELP -error- No manifest received for live

Yesterday i updated the engine to 4.8 and worked in my project as usual and today before i had imagine the best AI blueprint, i have that message when i run the engine. if i choose Retry it loops the error and if i click on No, it starts to load the 4.7 launcher with a never ending loading. Please help. An fast if it is possible! TY
Im in Argentina, Buenos Aires, Bahía Blanca.