Why am I getting a converting data type error when Selecting a decimal column?

I am trying to SELECT a column from a view as shown. The datatype of the column is stored as a decimal. - (decimal(18, 7), null)

SELECT DecimalPercentageColumn FROM dbo.DetailsView

However when I try to do this an error message is returned:

Msg 8114, Level 16, State 5, Line 1 Error converting data type nvarchar to numeric.

via Chebli Mohamed