eVC AHB: use of get_first_address()

Hello,

I'm using the eVC AHB. I would send a write burst starting from a random address and read back the data starting from the same address of the write transaction. I saw that in the vr_ahb_master_driven_burst.e there is the method get_first_address(). I tried to use it in the following way:
        
         var rd_first_addr : vr_ahb_address;
         rd_first_addr = burst.get_first_address();

but I get the error message: Cannot access method 'get_first_address' of package 'vr_ahb'.
While using :  rd_first_addr = write_burst.first_address; works fine.
The method get_first_address(); returns the firs_address, I do not understand why I get the error message when I compile the e code.
In the same test I call a different method defined in the same file (e.g. .get_transaction_bursts()) that works properly.

Many thanks,

David.