MyBB Internal Error on Registration

[al7bar]

When ever a member tries to register on my forum they get this 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(741) : eval()'d code
Line: 45
Backtrace:
File	Line	Function
/inc/class_error.php	206	errorHandler->output_error
/member.php(741) : eval()'d code	45	errorHandler->error
/member.php	741	eval

[Nathan Malcolm]

Uninstall the recaptcha plugin.

[Paul H.]

http://community.mybb.com/thread-110481-...04020.html