Problem With elgg

Hi, I'm new at this and need your help because I have a few errors that do not resolve


A failure to provide to remove or ban a user it skips the error 404.

2 Failed to make an avatar jump me 
and add the friends the error  missing _token or _ts field

And finally to activate riverdashboard gets letters and the rest blank.

Greetings, I hope your answer
Thanks

PD: Sorry for my bad english