The map service cannot be previewed when a map document has symbology set on a float type field with unique values, and when all other values are unchecked.
This issue is not reproducible in the current release of the software. Contact ESRI Technical Support (for users in the United States) or ESRI distributor (for users outside the United States) to resolve this issue, if the issue persists.
解决办法
Use a long integer field, instead of a float field.