Portal runtime error

Hi all,

I have created a visualization user in Process Control 3.0 and when I´ve logged with that user to the portal, it shows a message like this:

Portal runtime error.

An exception ocurred while processing your request. Send the exception ID to your portal administrator.

Exception ID: HH:MM_DD/MM/YY/_Id

Refer to the log file for details about this exception.

Then, I go to the log and it shows the following text:

ACCESS.ERROR: Authorization check for caller assignment to J2EE security role referencing J2EE security role .

I´ve read some threads but I don´t have any clue related with.

Can anybody help me, please?