Description
The Quartus® II software versions 10.0 and later may generate this error if you have spaces in your project path name. When this is the case, other variation files such as Verilog HDL (.v) or VHDL (.vhd) are created in your project folder, but the Block Symbol File (.bsf) is not created.
To work around this issue, make sure that project name and project path does not contain spaces.