Register problem (I agree)

[Andrew HF]

So I just made my website and when I got my cousin to register it says this "
MyBB Internal Error
MyBB has experienced an internal error and cannot continue.

Error Type:
Catchable Fatal Error (4096)
Error Message:
Object of class captcha could not be converted to string
Location:
File: member.php(769) : eval()'d code
Line: 44
Backtrace:
File Line Function
/inc/class_error.php 206 errorHandler->output_error
/member.php(769) : eval()'d code 44 errorHandler->error
/member.php 769 eval "
Can anyone help me with this?

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Nvm, I found out that the problem had to do with the theme I was using.