[R] error in creating gantt chart.

[rajclinasia]

hi every one,
i have a excel sheet like this

       labels   starts     ends
1  first task 1-Jan-04 3-Mar-04
2 second task 2-Feb-04 5-May-04
3  third task 3-Mar-04 6-Jun-04
4 fourth task 4-Apr-04 8-Aug-04
5  fifth task 5-May-04 9-Sep-04

now i converted this excel sheet into csv file and i read the csv file into
R with the below code.

my.gantt.info<-read.csv("C:/Documents and
Settings/balakrishna/Desktop/one.csv").

and for create gantt chart i used below code.

 gantt.chart("my.gantt.info").

if i run this above code i am getting the error like this 

Error in x$starts : $ operator is invalid for atomic vectors.

 can anybody help in this aspect it would be very appreciable.
Thanks in Advance.
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