Not able to add field to SSRS report

Hello

I have an existing report which has multiple groups. I need to add an additional field to one of the rows which  has a group on it.

When I add the field I get the error message below. What can I do to fix it?

This is the field I added: ="Date Recovery: " & First(format(Fields!date_of_recovery.Value,"MM-dd-yyyy") )& ""

Error      1      [rsFieldReference] The Value expression for the textbox ‘textbox123’ refers to the field ‘date_of_recovery’.  Report item expressions can only refer to fields within the current data set scope or, if inside an aggregate, the specified data set scope.      

Thanks,
SanjeetAsked:
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planoczCommented:
Have to tried to delete the dataset from the report and readd it again?
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SanjeetAuthor Commented:
This worked!
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