The extention does not contain valid signature...".

Question

Hi
I made .ZPX file. But during unpacking it shows an alert "The extention does not contain valid signature...". What can be reason and how to fix it?

Answer 1

Hi Maxim3,
It is difficult to tell what is wrong with your ZXP without inspecting what's inside it, but here are a few things which could cause this kind of error in Extension Manager
Adding files to the ZXP after it has already been signed
Adding a whole folder to a ZXP, rather than the contents of a folder (since Extension Manager won't find your MXI in the root level of your ZXP)
Adding files which contain double-byte characters (e.g. Traditional Chinese)
The command should have looked something like this:
java -jar ucf.jar -package  -storetype PKCS12 -keystore cert.p12 -storepass password outputfile.zxp -C "/inputfolder" .
[note the dot (.) at the end of the command]
Probably the easiest way to package a ZXP is using Adobe Exchange Packager:
https://www.adobeexchange.com/api/Packager.exe
https://www.adobeexchange.com/api/Packager.dmg
...as you can use this to create self-signed certificates, and it guides you through the process of packaging and signing.
Fraser