MOdelSim doesn't support multiple modules in single .v file?

Ragazzi ho lo stesso problema : mi da questo errore, potreste darmi una mano gentilmente ?Grazie anticipatamente per la risposta.

Determining the location of the ModelSim executable...Using: C:\altera\13.1\modelsim_ase\win32aloem

To specify a ModelSim executable directory, select: Tools -> Options -> EDA Tool Options

Note: if both ModelSim-Altera and ModelSim executables are available, ModelSim-Altera will be used.

**** Generating the ModelSim Testbench ****

quartus_eda --gen_testbench --check_outputs=on --tool=modelsim_oem --format=verilog boh -c boh --vector_source=C:/Users/Luca/Desktop/progetti con il quartus 13.1(ultima versione)/Waveform.vwf --testbench_file=C:/Users/Luca/Desktop/progetti con il quartus 13.1(ultima versione)/simulation/qsim/Waveform.vwf.vt

Error (23028): Unknown argument "con". Refer to --help for legal arguments.

Usage:

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quartus_eda [-h | --help[=] | -v]

quartus_eda []

quartus_eda -t

Error.