Hi Jonathan,
I have not seen this particular error message before and our testing with the Juno 5 has not produced this error, but I do have some tips for troubleshooting your data:
- If you can, try opening your project on a few machines like Windows Desktop or any older Windows Mobile Devices. Does this make a difference?
- Try opening a blank map then adding the axf to the map. Do you get the same error?
- Try creating another checkout WITHOUT adding the Feature Service URL to the axf. Does it open in ArcPad?
- Try removing the layer that is connected to the Feature Service from your project and perform another checkout. Does this project produce the same error?
- Repeat for the rest of the layers in your project (removing them one by one) to further narrow down the issue.
This should let you know if you are dealing with an issue with the hardware, software or with the data.
Esri Tech Support should be able to help you out if you cannot resolve the error and the answers to the above questions should point them in the right direction.
Hannah 🙂