Why can't I compile a Quartus II project containing HDL from multiple DSP Builder Advanced Blockset subsystems?

When HDL is generated by DSP Builder Advanced Blockset, a file called <model name>_safe_path.vhd is created for each Advanced Blockset design/subsystem in the Simulink model. When integrating HDL generated from multiple Advanced Blockset designs/subsystems from a single Simulink model into a single Quartus II project, two files with the name <model name>_safe_path.vhd will be included in the project and cause a compilation error. To avoid this, remove one of the <model name>_safe_path.vhd files and run the compilation again.

This problem will be fixed in a future version of the software.