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Excel upload error - block[ 2 ] already removed

Error : System.IO.IOException: block[ 2 ] already removed at NPOI.POIFS.Storage.BlockListImpl.Remove(Int32 index) 

Some information on this error can be found here:

It looks like it is caused by non-standard spreadsheet editing software. This can be resolved by copy pasting the data into a new spreadsheet using spreadsheet software known to be good e.g. Excel 2013.

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