plugin works in runtime, does not after deployment

I have completed my first eclipse plugin and it works perfectly in runtime. When I export it problems begin.

1. What are the differences between runtime and deployment of the plugin in
general? I.E. what could I be doing wrong at deployment...

2. The plugin still works after I deploy it, however when it comes to a line where I am calling an third party plugin it throws an java.lang.NoSuchMethodError:. (It works perfectly in runtime)

Is there anything I can do?

Solved this myself. Providing solution for someone in the same situation.

The problem was silly of course. The third part plugin was a different version in source (at runtime) than deployed. They were not compatible.

Temporary solution: I deployed the third party plugin and now everything works. Waiting for the source of the newer version of third party plugin.