[Tinyos-help] 'str' object is not callable

[VJ shekar]

Hello all,
I have tried running "packets.py" using the command "python packets.py" in
cygwin shell.
But it is giving TypeError which says 'str' object not callable.
Here are the lines appeared in shell.

VJ at Vijay /cygdrive/c/tinyos/cygwin/opt/tinyos-2.x/apps/radiocounttoleds
$ python packets.py
DEBUG (0): RadioCountToLedsC: timer fired, counter is 1.
DEBUG (0): RadioCountToLedsC: packet sent.
DEBUG (1): RadioCountToLedsC: timer fired, counter is 1.
DEBUG (1): RadioCountToLedsC: packet sent.
DEBUG (0): RadioCountToLedsC: timer fired, counter is 2.
DEBUG (0): RadioCountToLedsC: packet sent.
DEBUG (1): RadioCountToLedsC: timer fired, counter is 2.
DEBUG (1): RadioCountToLedsC: packet sent.
DEBUG (0): RadioCountToLedsC: timer fired, counter is 3.
DEBUG (0): RadioCountToLedsC: packet sent.
Traceback (most recent call last):
  File "packets.py", line 47, in <module>
    print "Delivering " + str(msg)+ " to 0 at " + str(t.time() + 3);
TypeError: 'str' object is not callable

Could anyone please suggest me how to get rid of this error.
Thanks in advance,
VJ.
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