lift-json java.lang.AbstractMethodError

[fmpwizard]

All of the sudden you get java.lang.AbstractMethodError errors at runtime using lift-json. You also use dispatch

answer:

Dispatch uses lift-json internally, this results in having two different versions of lift-json in your classpath

If you are using sbt, enter this in your build.sbt

"net.databinder" %% "dispatch-lift-json" % dispatchVersion intransitive()

see also:

[enter new page for "Potentially incompatible versions of dependencies of {file:/.....i/}default-32219c:org.scala-lang: 2.9.1, 2.9.0-1"] warning when compiling your project