Your pc is running a program which is using the same port as CMS 3.0. To solve, you can edit {CMS 3.0 Installation Path}/tomcat/conf/server.xml. Search for the following text
<Connector po......
You need to export the whole drug list and then change the stock to 0 manually.
The steps shown below
1. Login as admin
2. Go to Admin->Inventory->Inventory Item
3. Click Export Xml
4. Fin......
