Object reference question

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Hello,
I have this procedure to convert a Multidimentional string array to an
int but I get an error on line 6
"Object reference not set to an instance of an object".But Ive created
my object on line 1
int i = 0;
1 uint[][] intArray = new uint[Sample.Length][];
2 for (i=0;i<(Sample.Length);i++)
3 {
4 for(int j=0;j<(Sample[i].Length);j++)
5 {
6 intArray[i][j]=UInt32.Parse(Sample[i]
[j],System.Globalization.NumberStyles.Integer);

}
}

What am I doing wrong?
.