I want to learn/play with Pier.
Starting with Pharo 20500 image, I loaded seaside30 and pier3 from the configurations browser. (ignored some warnings).

Then I do:
PRPierFrame registerAsApplication: 'emptyPier' kernel: PRPierFrame exampleEmpty .

but I get WARequestContextNotFound error.

How can I make it work? Should I be using seaside2.8? What is the difference between pier2 and pier3?

thx.