QSys doesn't create all output files during generation

I'm trying to build system for DE0_Nano board using Qsys (QuartusII, 11.1 SP2).

System preparation and generation by Qsys are passed without errors,

but Quartus Analysis&Elaboration give fatal errors (12006):

Node instance "XX" instantiates undefined entity "DE0_N_QSys_XX"

only for some included entities.

More details below.

Project setting:

Device: Cyclone IV E device EP4CE22F17C6;

Files : ProjDir/Test_0 // Top-Level entity

ProjDir/DE0_N_QSys/synthesis/DE0_N_QSys.qip

/DE0_N_QSys.v

/submodules/......

System consist of the following components:

1. clock Source (nameed as clk_50)

2. Nios II/e CPU (cpu)

3. JTAG UART (jtag_uart)

4. On-Chip Memory RAM (onchip_memory2)

5. System ID (sysid)

6. Parallel i/O [7:0] (led) //8 LED's

7. Parallel I/o [3:0] (sw) //4 switches

8. Parallel I/o [1:0] (key) //2 keys

Qsys generation passed with 0 errors and 2 warnings:

Warning: system: "No matching role found for jtag_uart:avalon_jtag_slave:dataavailable (dataavailable)"

Warning: system: "No matching role found for jtag_uart:avalon_jtag_slave:readyfordata (readyfordata)"

After creating the system named as DE0_N_QSys and closing Qsys Quartus starts Analysis&Elaboration.

Everything going smoothly but then errors appear:

Error: Quartus II 32-bit Analysis & Elaboration was unsuccessful. 5 errors, 5 warnings

Error: Peak virtual memory: 311 megabytes

Error: Processing ended: Mon Mar 14 23:50:20 2016

Error: Elapsed time: 00:00:47

Error: Total CPU time (on all processors): 00:00:09

Error (12006): Node instance "sw" instantiates undefined entity "DE0_N_QSys_sw"

Shortly (the same for all 5 errors (12006)):

1. sw -> "DE0_N_QSys_sw"

2. onchip_memory2 -> "DE0_N_QSys_onchip_memory2"

3. led -> "DE0_N_QSys_led"

4. key -> "DE0_N_QSys_key"

5. jtag_uart -> "DE0_N_QSys_jtag_uart"

Looking at directory DE0_N_QSys/synthesis/submodules, corresponding verilog files

(DE0_N_QSys_sw.v,...) are missing. I gues that is reason of errors.

Even using Demontration example from CD included in development Terasic DE0-Nano board, if I recompile it,

the same situation happens.

Please, help me to solve this problem of undefined entity!