arcgis里dissolve融合时，出现错误WARNING 000117: 警告: 生成的输出为空。怎么解决？

Description
The output created or modified has no features. For instance, running the Delete Features or Delete Rows tool on a feature class or table would remove all the features or rows. A common occurrence of this warning occurs when the Extent (or XYDomain) environment has been set previously for a geographically distinct area. Since the Extent environment is used to limit the features used, an inappropriately set Extent environment could exclude all features.
Solution
If this warning is unexpected, check the Extent environment to ensure that it is appropriate for the data being used.

可能是输入文件的坐标系未知，
解决办法：
在环境中设置输出坐标系为指定坐标系

可能是因为把Lay View打开了，可以关了或者重新启动Arcmap