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I used your tutorial in Embedded Systems. I followed the instructions in the tutorial but the compilation with quartus II brought some errors. here is a printout. Error: Node instance "auto_inst" instantiates undefined entity "cos_Approximator_GN" Error: Node instance "auto_inst" instantiates undefined entity "de1_vga_dma_GNWPAU3OZZ" Error: Node instance "auto_inst" instantiates undefined entity "phase_Generator_GNMVMS3CBU" I unpacked all files, which were in the archive and these are still available in my quartusproject/ip folder. I'm using the NIOS II 9.1 EDS without . The Generation with the SoPC Builder was succesfull.