meta-data in mainfest is not working for old project.

I am using this type of code to write in mainfest. In my new project extension works fine. But in my old project is is unable to write those values.
Is there anything wrong? Can any one explain please?

@UsesApplicationMetadata(metaDataElements={"ExampleName", value="ExampleValue"),"Example1", value="Example2")})

There's not really enough information to diagnose the problem, but it could be related to the previously reported issue with services in extensions when mixed with older extensions.

First sorry for my fault and thank you so much for your reply. I will rebuild that extension with a new version and I will inform.