CheckSum error.

[DaveWilliams]

Trying to do Post Updates to our server which previously was not a problem and now all our mobile devices provide the following error:

CheckSum error. The mobile service schema has been changed and your cache is now invalid.... We touch our server.  Cant seem to find a way to remedy the situation of an application to get the data off the devices. Help!!! Runnin Arc Server 9.3

[AkhilParujanwala]

This happens if you touched your MXD.

So for example when you create your MXD and make it a ArcGIS Service. Sure you can use the MXD again to play with and such, maybe modify things, but never save your MXD again. That's my rule of thumb. Any changes to the original MXD will cause a checksum error.

So instead, of using the original MXD, I make a new map document and bring in the featureclasses that we are using and then perform analysis and maps and such, and you can save that mxd no problem.

Leave the original mxd alone.

I suppose you can open the original MXD and change things back to what it was when your synchronization worked. I hope this helps.

[ChristopherOlsen]

Here's the textbook definition of the idea:
Checksum error- Web service schema and mobile cache schema do not match. This indicates that the map schema has been altered after the map cache schema was created on the device. This may occur if you created and deployed a map to the mobile device and then changed the map document that is published as a web service.

In addition, here is some information on the checksum process:
http://blogs.esri.com/dev/blogs/mobilecentral/archive/2009/05/18/mobile-cache-to-shapefile-tool-and-...