This error indicates that there is a mismatch between the package name of the original package and that of the upgraded package. This results in the App-V client incorrectly determining that there is a duplicate GUID, since the package GUID in both manifests will be the same. To successfully upgrade a package, both of the following conditions must be true:
1. The package GUID must be the same (the Version tag and VERSIONGUID tag will change).
2. The package name must be exactly the same. This can be verified by opening the original and upgrade package's manifest XML in a text editor to compare the NAME and GUID tags.
The NAME tag is derived from the Package Name field on the General Properties tab of the package. The App-V Sequencer allows this field to be changed after sequencing a package but before saving the files. To avoid this error, do not edit this field.
In a second variation, the Microsoft System Center Configuration Manager (ConfigMgr) Virtual Application Package Update Wizard allows for the Name: field to be changed on its General page. Editing the Name: or Version: fields of the New Package's values will result in the errors above.
To avoid the 04-0000180C and 6156 errors listed above, do not change the package name in either the App-V Sequencer or the ConfigMgr Virtual Application Package Update Wizard. If the package manifest file is correct, simply re-run the Virtual Application Package Update Wizard without changing any values. If the package name has been changed in the Sequencer, re-sequence the application and do not change this value.