Dear Sir,
This specific design has an error, follow these steps in order to fix the issue:
1) Open StellarIP
2) Open ZC706_FMC30RF
3) Answer yes to load the local library
4) Choose "Design details" from the "Design" menu
5) Under target, please select XC7Z045-2FFG900 right of "FPGA Type"
6) You can either "Fix it" or "Ignore" the warning about FPGA revision.
7) You can save your design.
After these steps you will be able to Generate your design.
Best Regards,
Arnaud