'null' is null or not an object PIE.htc line 88 character 1

[ghost]

HTML

`

• Login
• Me
• My Apps

` ## CSS:

.nav-tabs > li > a { behavior: url('https://mydomain.com/css/PIE.htc'); border-radius: 7px 7px 0 0; font-size:20px; padding-bottom: 5px; padding-top: 5px; color:#063d8a }

ERROR:

'null' is null or not an object PIE.htc line 88 character 1

INFO:

PIE.htc: Version 1.0.0
IE8: 8.0.6001.187021C