ID:24243 The Fitter must be run complete 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 the EDA Tool Settings menu. You must run the Fitter completely before you can use the EDA Netlist Writer to generate IBIS Output Files (.ibs)

ACTION: Run the Fitter completely before running the EDA Netlist Writer.