yes, it was the cache. Thanks.

@hlolli: but that brings up the point that the error message should explain that you should try to hit shift refresh and possibly get the new code

PSA: I've noticed, more than once, that people have [lein-figwheel some-version] listed under their :dependencies, please don't do this. If you need access to figwheel at runtime only list figwheel-sidecar in your dependencies.