Error (199057): Maintain hierarchy value "" for --maintain_design_hierarchy option is illegal. Refer to--help for legal maintain hierarchy values. - Error (199057): Maintain hierarchy value "" for --maintain_design_hierarchy option is illegal. Refer to--help for legal maintain hierarchy values. Description In the Quartus® II software version 11.1 and later, this error may be seen when running quartus_eda from the command line and using the option --maintain_design_hierarchy . Resolution To work around this error, specify either on or off to the --maintain_design_hierarchy option when running the quartus_eda command. For example quartus_eda --maintain_design_hierarchy=on ... Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 11.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']