gcm-server.jar bad major version at offset=6
I have a problem with gcm-server.jar. 
Until yesterday everything worked fine, now when I deploy my war file to server I get this error:

    java.lang.UnsupportedClassVersionError: (com/google/android/gcm/server/InvalidRequestException) bad major version at offset=6


When I open gcm-server.jar there is comment: 

    Compiled from InvalidRequestException.java (version 1.6 : 50.0, super bit)

I'm using eclipse running java5. 
What I need to do have it working with java5?

Thank you for your help.
gcm-server.jar bad major version at offset=6
===

I have a problem with gcm-server.jar. 
Until yesterday everything worked fine, now when I deploy my war file to server I get this error:

    java.lang.UnsupportedClassVersionError: (com/google/android/gcm/server/InvalidRequestException) bad major version at offset=6


When I open gcm-server.jar there is comment: 

    Compiled from InvalidRequestException.java (version 1.6 : 50.0, super bit)

I'm using eclipse running java5. 
What I need to do have it working with java5?

Thank you for your help.