I see the following messages in the log window when running synthesis in the Vivado 2013.2 or 2013.3 tools:
INFO: [Common 17-78] Attempting to get a license: Internal_bitstream
WARNING: [Common 17-301] Failed to get a license: Internal_bitstream
What does it mean?
These error messages can be ignored. The "internal_bitstream" license check is being incorrectly echoed to the log console. The check is for internal Vivado use only and will not affect a design flow.
The message has been removed in Vivado Design Suite 2013.4.