Can you assist me with my issue with LoL checker?

[ruzzlzz]

Hello Nulled,
I've been having troubles with LoL checker recently as i just started using it again after couple of months, i updated it with the .json file however, it is giving me '' exception found: Input string was not in a correct format ''
I do not know why it is giving me this, but i would appreciate it if anyone could help me. Thank you