Problems using user defined activitys in Process Flows

Hi everybody,
i have problems using an user defined activity in my owb process flow.
I did the following according to https://blogs.oracle.com/warehousebuilder/entry/how_to_use_user_defined_activity_in_owb_process_flow.
1. create a script in /tmp called test.sh
2. chmod +x on the script so it can be executed
3. Changed the Runtime.properties file under ORACLE_HOME/owb/bin/admin
property.RuntimePlatform.0.NativeExecution.FTP.security_constraint = NATIVE_JAVA
property.RuntimePlatform.0.NativeExecution.Shell.security_constraint = NATIVE_JAVA
property.RuntimePlatform.0.NativeExecution.SQLPlus.security_constraint = NATIVE_JAVA
property.RuntimePlatform.0.NativeExecution.OMBPlus.security_constraint = NATIVE_JAVA
4. Creating an Process Flow with just the user defined activity
5. Deploying the Process flow was successfull
But everytime i execute the pf i get the following error in my Job Details.
TEST_PF:USER_DEFINED                                        
Parameters                                                  
Log file is available. Click Information button to view.                                             
It says Log file is available. But i can't find this file. Also i don't know what the problem is.
Can anybody help me out of this?
Thanks a lot

Hi,
solved the problem by myself.
I had problems with my script. So i insert set -x into the script an executed the pf again. Know i can see whats happening in a log. You can find this log in the job detail window by pressing the blue ! Button when the whole PF (the first entry) is marked.
Greetings

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