Unknown runtime error on login page when using IE 9.

Server Ubuntu 12.04.1 ISPConfig 3.0.4.6

Client Windows7 IE 9

My client said that When going to login panel on port 8080, it occurs error[Unknown runtime error].

But, I tried to get the error using IE 9, No error happened. However, using it in IE Tester, this occured.

Error code: Unknown runtime error line 67 letter 4

And, it doesn't occur on ISPConfig 3.0.5 beta.