ID:18934 The Fitter must be run at least through the Plan stage before board-level IBIS output files can be generated.

CAUSE: You specified board-level IBIS Output File (.ibs) generation for the current project either via command line options --board_signal_integrity --format=ibis or --ibis (deprecated), global QSF assignments to EDA_BOARD_DESIGN_SIGNAL_INTEGRITY_TOOL and EDA_OUTPUT_DATA_FORMAT, or by selecting the IBIS Format for the Board-Level Signal Integrity Tool under EDA Tool Settings menu. However you must run the Fitter at least through the Plan stage before you can use the EDA Netlist Writer to generate IBIS Output Files (.ibs)

ACTION: Run the Fitter at least through the Plan stage before running the EDA Netlist Writer.