You configured a machine to be a network license server and then installed an Autodesk product on the same machine. When you launch the product, it tries to check out a network license and fails. This seems to affect most 2010 products.
On Windows, the FLEXnet Finder dialog displays and, when dismissed, is followed by a license error dialog displaying the error code [-15.570.36]. In the Mac OS, a license error dialog displays the same error code but it does not display a FLEXnet Finder dialog.
Find the solution is this Knowledge Base document: Failure to check out a license when running a network product on the same machine as the network license server