PI Enterprise Services Builder Or Integration Builder Start Error

Symptom
When You try start PI Enterprise Services Builder or Integration Builder tools we have error, for example as bellow

Internal problem occured (INTERNAL_PROBLEM)

Solution

1. Go to “http://<host>:<port>/dir/ -> Administration Tab

2. Click on Java Web Start Administration and click on  Restore Archives and Generate New Signature

3. Wait 15 min

4. Restart the J2EE server

If you have another error which occur when logging in to the Process Integration (PI) Enterprise Services Repository (ESR) or Integration Builder tools, you can see SAP documentation Troubleshooting PI ESR and Integration Builder Logon Issues