crystal report duplication

[accessred]

I have some crystal reports in my maintanance project.when ever we are editing anything inside the crystal report (Cry_variablepay.rpt),its automatically generating another crystal report file (Cry_variablepay1.rpt) in the project file itself. the application shows build error showing that "the namespace already contains a definition for Cry_variables" ......ie; the newly created crystal report file has the same namespace as the older one. so i cant able to build the project wthout error...can anybdy suggest the reason and solution...