wb-free does not work

[TTeubler]

10:39:12,253 ERROR - Error while running bean shell script: Sourced file: D:\wis
ebed\tr.experimentation-scripts-0.8\bin...\scripts\wb-free.java : Method Invoc
ation sessionManagement.free : at Line: 13 : in file: D:\wisebed\tr.experimentat
ion-scripts-0.8\bin...\scripts\wb-free.java : sessionManagement .free ( helper
.parseSecretReservationKeys ( secretReservationKeys ) )

Target exception: eu.wisebed.api.sm.ExperimentNotRunningException_Exception: Exp
eriment with secret reservation key "08B6DD26C3AB53F998EF795884B13771" either do
es not exist or is currently not running.

Sourced file: D:\wisebed\tr.experimentation-scripts-0.8\bin...\scripts\wb-free
.java : Method Invocation sessionManagement.free : at Line: 13 : in file: D:\wis
ebed\tr.experimentation-scripts-0.8\bin...\scripts\wb-free.java : sessionManag
ement .free ( helper .parseSecretReservationKeys ( secretReservationKeys ) )

Target exception: eu.wisebed.api.sm.ExperimentNotRunningException_Exception: Exp
eriment with secret reservation key "08B6DD26C3AB53F998EF795884B13771" either do
es not exist or is currently not running.

    at bsh.BSHMethodInvocation.eval(Unknown Source)
    at bsh.BSHPrimaryExpression.eval(Unknown Source)
    at bsh.BSHPrimaryExpression.eval(Unknown Source)
    at bsh.Interpreter.eval(Unknown Source)
    at bsh.Interpreter.source(Unknown Source)
    at bsh.Interpreter.source(Unknown Source)
    at de.uniluebeck.itm.wisebed.cmdlineclient.WisebedBeanShellLauncher.main

(WisebedBeanShellLauncher.java:151)