Error while modifying logon page

Hi All,

I am trying to modify the text present on the log on page. For this I modifying the par file com.sap.portal.runtime.logon.par.bak. After deploying the par file and changing the authschemes.xml file, I get the following error when I open my portal:

<b>Portal Runtime Error

An exception occurred while processing a request for :

iView : N/A

Component Name : N/A

The exception was logged. Inform your system administrator..

See the details for the exception ID in the log file</b>

When I go ahead and see the log file, I get the following error:

<b>An error occured during authscheme computation.

[EXCEPTION]

com.sapportals.portal.prt.component.PortalComponentException: Error in init method

Component : com.igt.logon.certlogon

at com.sapportals.portal.prt.component.PortalComponentContext.init(PortalComponentContext.java:251)

at com.sapportals.portal.prt.core.broker.PortalComponentContextItem.refresh(PortalComponentContextItem.java:267)

at com.sapportals.portal.prt.core.broker.PortalComponentContextItem.getContext(PortalComponentContextItem.java:312)

at com.sapportals.portal.prt.component.PortalComponentRequest.getComponentContext(PortalComponentRequest.java:385)

at com.sapportals.portal.prt.service.authenticationservice.AuthenticationService.getLogonIView(AuthenticationService.java:235)

at com.sapportals.portal.prt.service.hook.SecurityHookService.doNodeHook(SecurityHookService.java:154)</b>

I looked at my authschemes file many times, but it looks good to me. Any idea where I am going wrong. Any help would be appreciated.

Thanks,

Tom