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Are you trying to add the Freon on the high side port?
Any time you need to add Freon to the system it has to be added through the low side port ( suction side) . The low side service port is located on the top of the Accumulator on the passenger side of the firewall. See the diagram in the link below.. The port is #1 in the diagram. Is this the port your using?https://dl.dropboxusercontent.com/u/104923897/Low%20side%20port%20May%2010.pdf
Okay that is the correct port, the AC needs to be on and the compressor running when you add the Freon. Was the AC on and running when you tried to add the Freon?
That may very well be the problem and if in fact that is the case the system will need to be evacuated and the shrader valve replaced.
Are you using a set of regular AC gauges to do this?
You will need a set of real gauges and a recovery machine to recover the Freon and the system is drained then the valve come out just like a valve stem in the tire. The do see the kit at any parts store as well. I think before you do that you should try adding the Freon with a regular set of AC gauges. There fitting usually fit much better then the cheaper charge kits you get with the Freon. If you can get the Freon to take with the gauges that would avoid having to drain the system.