Vivado webpack synthesis license error when followung UG888

ug888UG888 Datasheet. Part #: UG80486DX4WB100. Datasheet: 18MbKb234P. Manufacturer: Intel Corporation. Description: Intel486 DX MICROPROCESSOR. 116 Results.I've just installed Vivado webpack 2014.2, obtained a license, and checked the license in the license manager. I began following the UG888 bft desn tutorial. I type: synth_desn -top