[Plugin: WHMCS Bridge] Sequence errors after update

After I updated the plugin, a sequence of errors began to occur on my site.
Among these errors, several special characters, the plugin can not login with an existing user.
Always returns the user or password does not exist.
I am also using WHMCS 5.1.2.

What should I do?

I’m leaving some printscreens for viewing the problem!

*Returning with error code
http://www.mscriacoes.com.br/app/print_7.png
http://www.mscriacoes.com.br/app/print_8.png

*Can not log a user that already exists
http://www.mscriacoes.com.br/app/print_9.png

*When creating a new user, no problems, but there is still returning an error code.
http://www.mscriacoes.com.br/app/print_10.png

http://wordpress.org/extend/plugins/whmcs-bridge/