Fix error "Could not find or load main class" on Talend

On Talend, if you have the following error when starting a job "Could not find or load main class", you can try the following workaround to unblock the problem :

• Open the .log file in workspace\metadata de Talend
• Search an error at the end of the file
• If it is like "Contains: Could not delete '..poms\jobs\process\target\classpath.jar'" :
• Delete the blocking file, which can be blocked by Java.
• If you can't because the file is in loaded, restart the computer or use a software likeLock Hunter.
• If the error is like "java.lang.NullPointerException at org.talend.designer.core.utils.DesignerUtilities$1.run(DesignerUtilities.java:125)" :
• Close Talend
• Close all Java processes which could refer to the job
• Restart Talend et try to execute the job