WARNING C500 (PORT IS BUSY)

Dear all,

When I type,

C:/Keil/C51/BIN/C51 foo.c DB OE NOCOND CD SB WL(1) NOAM INCDIR(a long list of include dir;)

Error Message:
C51 COMPILER V7.20 - SN: C1S7P-60655E
COPYRIGHT KEIL ELEKTRONIK GmbH 1987 - 2004
*** WARNING C500 IN LINE 1 OF foo.c: MISSING DEVICE (PORT IS BUSY)

When I disable listing file (i.e. NOPR), it works well. But When I want C51 produce listing files, it fails and error messages is as above.

Does any one know how to fix it?
Thx for your help.

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