Not a bug HTTP ERROR 500 Login Website By Facebook

[tiepthibanhang.net]

Dear all,
Please help me, my website show error below please help me. Thank you very much.

Error below show when user login website by facebook nick. And I also attack the pic of the screen.
Please tell me to fix it.

Thank you very much.

Server Error Log
Error Info
ErrorException: Fatal Error: Call to undefined function iconv_strlen() - library/Zend/Validate/Hostname.php:1263
Generated By: Unknown Account, 9 phút trước
Stack Trace
#0 [internal function]: XenForo_Application::handleFatalError()
#1 {main}
Request State
array(3) {
["url"] => string(436) "Hãy đăng nhập hoặc đăng ký để xem được links"
["_GET"] => array(2) {
["code"] => string(344) "AQCtekaehzmGglXeRq0Fw8_rqVSheFPO8hTd6Ez3_mBEiwsXONmG17lf2Whgv0OckdguQklrKm_wqHAI9fIiEuUJ1Dr1lHs_1rx02NvVk3YIvt5qdQiGVm7XC7cK29dcXESg92o4NIvvVDLZWHHkgKUyVOVHj5uqQI0qaEXXwUaJBNrBMrW0W7_xAio4yD0UlXagjvXZjgKEq6GLqN6eYm5qwvCw9cUJnuqVN3XZnyiWOb4BTKHZXImq-6IOyZSN4vk4dBSji8y-UkDtkoj24FzesnoM4Mu0eFoKSKeFn4uQ_wU26trFs330alp8uLS5P8CsM6Na1ESLJeTtPbzXemna"
["state"] => string(32) "291664097402ee990e30f3d8c22bf1e8"
}
["_POST"] => array(0) {
}
}

 

[Mike]

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