Quartus Prime Lite - Difficulties with simulation

I tried including the "modular_adc_0" library and get this:

#  Loading modular_adc_0.adc_core_modular_adc_0
#  ** Error: (vsim-3033) /home/swinchen/quartus/robot_board_test/adc_core/simulation/submodules/adc_core_modular_adc_0.v(26): Instantiation of 'adc_core_modular_adc_0_control_internal' failed. The design unit was not found.
#     Time: 0 ps  Iteration: 0  Instance: /robot_board_tb/dut/adc_inst/modular_adc_0 File: /home/swinchen/quartus/robot_board_test/adc_core/simulation/submodules/adc_core_modular_adc_0.v
#          Searched libraries:
#              /home/swinchen/quartus/robot_board_test/simulation/modelsim/robot_board_test_iputf_libs/modular_adc_0
#              /home/swinchen/quartus/robot_board_test/simulation/modelsim/rtl_work
#  Loading work.slave_spi_interface(rtl)
#  Error loading design
#  End time: 10:57:09 on Feb 09,2018, Elapsed time: 0:00:00
#  Errors: 1, Warnings: 0