Help with spatial reference

Discussion created by killahink on Aug 2, 2013
Latest reply on Aug 2, 2013 by lpinner

I have ArcGIS 10,and i have my data in a shape file. when ever i add the data to arcmap i get this error:

" Unknown spatial Reference, The following data source you added are missing spatial reference information.this data can be drawn in ArcMap, but can not be projected"

so if you can help me out on how to add this spatial reference

thanx you