Invalid value in column...

Error:

Invalid value in column: '{0}'. Valid values are Y, N or empty.

Explanation:

The indicated column contains an invalid value, i.e. an entry that is not allowed in this type of column. Only Y, N or no entry is allowed in this column. This is called a boolean field. For more information on this, click here.

Solution:

Remove the invalid value and replace it with Y, N, or nothing.