Running Seph benchmark bench/bench_arithmetic.sp with the runtime on the class path results in NCDFEs:

$ java -cp ./lib/seph.jar seph.lang.Main bench/bench_arithmetic.sp
...
java.lang.NoClassDefFoundError: seph/lang/SephObject
        at java.lang.invoke.MethodHandle.invokeExact(MethodHandle.java)
        at java.lang.invoke.MethodHandle.invokeExact(MethodHandle.java)
        at seph$gen$abstraction$0$toplevel.argument_0_3(bench/bench_arithmetic.sp:106)
        at seph.lang.ControlDefaultBehavior.evaluateArgument(ControlDefaultBehavior.java:23)
        at seph.lang.Base.benchmark(Base.java:99)
        at seph.lang.bim.BaseBase.benchmark(BaseBase.java:102)
        at seph$gen$abstraction$0$toplevel.toplevel(bench/bench_arithmetic.sp:114)
        at seph.lang.Runtime.evaluateStream(Runtime.java:90)
        at seph.lang.Runtime.evaluateFile(Runtime.java:107)
        at seph.lang.Main.main(Main.java:93)
...