Unable to import a file as test case in Testlink 1.9.2

[sangeetha K]

Hi,
Installed "Testlink 1.9.2" successfully
Created a project and test suites for the same, When I tried to create test cases for the same by importing an XLS/XML file
I am getting a popup window with the following message.

"To display this page, Firefox must send information that will repeat any action (such as a search or order confirmation) that was performed earlier." with (Retry/Cancel) buttons

Note: I tried both in Mozilla and IE.

Please help me to solve the issue. Thank u