If I set the top level HDL wrapper of a block diagram to Out Of Context, the following error occurs in Vivado during Synthesis:
There are no HDL source in file set 'sources_1'.
Please use the Add Sources command
The top level wrapper of a module should never be set to OOC.
The proper way to set a block diagram to OOC is to set the .bd under the top level HDL wrapper to be OOC.