eclipse project suddenly found a lot of class error, the reason being given is not part of the package lead, but the package does exist, then the reason cited is that this package can not form into a folder, and now need to modify the back.
Style after the problems are as follows:
The package as folders to form the following steps:
1. Right-click the item, then click Properties, the pop-up window, select Java Build Path, then select the Source tab, expand find Excluded.
Under normal circumstances it should be None, now found ××, so you need to modify it:
2. Direct the figure above two ** can be deleted.
