How to solve this " The design unit was not found" in Modelsim

Hi, All.

Please look at my problem and give a tip.. T.T

Environment: Altera11.1, Modelsim 10.0c, MAX7000S

Work:

1. Designing a schematic: I used Block or symbols stored into "other-maxplus2-4count" of the altera11.1 library

2. And then compiling and creating this ~.bdf into ~.v file

3. In order to simulate ~.v file, run Modelsim. But this problem happened

Loading some flip-flop and divider components is okay. But this is cannot be solved.

Please help me

Example Error code

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vsim work.testbench_test# vsim work.testbench_test # Loading work.testbench_test# Loading work.test# ** Error: (vsim-3033) C:/altera/11.1/temp/test.v(54): Instantiation of 'count4' failed. The design unit was not found.# Region: /testbench_test/U1_test# Searched libraries:# C:\altera\11.1\temp\work# Error loading design

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Thanks in advance, all