Are you sure that 'DataSet1' is the name of a dataset that you currently have?
You may want to take a look at your report and ensure that you actually have a DataSet that is being referenced called DataSet1 (as that is the default dataset name), otherwise try changing any appearances of DataSet1 to one of your current DataSets.
This could have occurred quite easily if you copy-pasted any elements within your Report as the data-binding information may not have come across.
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A data source instance has not been supplied for the data source 'DataSet1'which exception should...
Dec 19, 2014 02:34 AM|saritapatil.888|LINK
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Re: A data source instance has not been supplied for the data source 'DataSet1'which exception sh...
Dec 19, 2014 08:31 AM|Rion Williams|LINK
Are you sure that 'DataSet1' is the name of a dataset that you currently have?
You may want to take a look at your report and ensure that you actually have a DataSet that is being referenced called DataSet1 (as that is the default dataset name), otherwise try changing any appearances of DataSet1 to one of your current DataSets. This could have occurred quite easily if you copy-pasted any elements within your Report as the data-binding information may not have come across.