Unspecified Error is thrown while expanding tree grid using selenium RC in IE8

[dparwani]

My project needs navigate through 2 levels of Tree Grid and then click on 3rd level child. E.g. parent node1-> child node1-> child node12. It will be more clear from looking into the code as:

selenium.click("scLocator=//TreeGrid[ID=\"isc_SideNavTree_0\"]/body/row[12]/col[fieldName=nodeTitle||0]/open");
selenium.click("scLocator=//TreeGrid[ID=\"isc_SideNavTree_0\"]/body/row[13]/col[fieldName=nodeTitle||0]/open");
selenium.click("scLocator=//TreeGrid[ID=\"isc_SideNavTree_0\"]/body/row[15]/col[fieldName=nodeTitle||0]");

But when I am running this code, its working fine in FF 10 browser but throwing below error in IE8 while clicking on parent node itself:
'com.thoughtworks.selenium.SeleniumException: ERROR: Command execution failure. Please search the user group at https://groups.google.com/forum/#!forum/selenium-users for error details from the log window. The error message is: Unspecified error.'

Kindly help me out to have this part of code working in IE8.

I am using smart gwt latest patched 2.5 version and using .js files provided under Selenium forlder in it.

[dparwani]

Still stuck

I'm still stuck on this can anyone provide any help on this.