Can't get to Nashkel mines

I've got a problem getting to nashkel mines. My 'important quest' got stuck at meeting with Jaheira and Khalid at the Friendly Arms inn. I met them, and they gave me the assignment to go to Naskel. They joined my party and i've cleared all of the maps surrounding Friendly Arms inn and Beregost with their help.
The Important quest still says that I will have to meet with Jaheira and Khalid so Nashkel is not available for me.
Please, help me!