Error: Node instance "sequencer_ram" instantiates undefined entity <variable><entity_name></variable>

IP cores that use UniPHY use the NIOS II toolchain, which requires the proper registration of Cygwin.If you use the MegaWizard Plug-In Manager to generate Memory Controller IP cores that use UniPHY without first launching a tool that registers Cygwin (Qsys, SOPC Builder, or the NIOS II Software Build Tools), Analysis and Synthesis of the generated core can fail with errors similar to the following:

Error: Node instance "sequencer_ram" instantiates undefined entity "core1_example_if0_p0_qsys_sequencer_sequencer_ram"

Analysis and Synthesis can also fail if you install Altera Complete Design Suite version 11.0 tools in one directory, and then reinstall them in a different directory, or if you use different paths on a network installation.

If you have used the MegaWizard Plug-In Manager without having launched a tool that registers Cygwin, force proper registration of Cygwin, by running:

‘/bin/qreg.exe -force’