How to overcome "empty output generated" error message

[Kofi_Lartey]

Hallo everybody, I am using a map polygon to clip data (shape file). Both data were projected to a new coordinate reference system (WGS 84 or Ghana Meter Grid). But the clip tool is throwing an exception "empty output generated". I have checked the log file but has not identified any conflict although the system suggests extents may have to be reset. I started by projecting both data to WGS 84  before clipping but changed to Ghana Meter grid to see if the result will be different, but both gave the same error message. I also stored both in a gdb, and the output also in a gdb. Any idea what i could be doing wrong?

[Kofi_Lartey]

Dan, No Z is not enabled but the attribute table has elevation values which when i added Z value and used Z coordinates to populate produced the same values as the elevation. The Z field in the table is populated with null values.

[Kofi_Lartey]

I must admit i have been working but what i did does not really make sense and off course it didnt work. I first opened a new field in the map to be clipped and using the calculate geometry tool populated it. I also opened a new field in the clip polygon and populated it with Z values (1) before using it to clip but same response. I also degitized the clip polygon and tried to use the Sketch properties feature to give Z values to each of the vortexes (over 700 of them). But when i opened the attribute table there was nothing in it. Well i read that digitization was one means to add z values to a polygon, maybe i missed something. But i used it to clip and same results. What next?

[Kofi_Lartey]

So all have been successful clipped, of course except those with z values. But how did you determine z value from the extent?