Request fail in version 2.0.6.

What steps will reproduce the problem?
1.After installation completed , then I called the link to enter front end . 
Error show in attached file. 
2.In according to r.php , the error come from {"code":999,"error":"Unexpected 
server error","details":"PHP error #8, Undefined variable: engine 
......./backend\/db\/mysql\/MySQLIDatabase.class.php:46)","data":null} 
3.

What is the expected output? What do you see instead?
I see the following attached file in below. 

What version of the product are you using? On what operating system?
2.0.6

Please provide any additional information below.

Original issue reported on code.google.com by sanlinht...@gmail.com on 19 Sep 2013 at 9:11

Attachments:

2013-09-19_134934.png

wifang / mollify

Request fail in version 2.0.6. #465