Error in mobile app: "Unexpected token < in JSON at position 1"

Error in mobile app: "Unexpected token < in JSON at position 1"

  

Hello,

When I try to open a mobile application in the device I get this error.

I can not login.

Can someone tell me what this error is referring to?

Can it be a connection error to the server?


Thanks in advance!

Are you loading any data on app opening?