An error occurred while reseting engine.

I wanted to change the default H2 database to MySQL database, so I followed this instruction .
After configuring the properties files, I used command line to start-bonita.bat, and I have some error messages like this one.

2017-02-07 14:20:00.396 -0500 SEVERE: org.apache.catalina.core.StandardService Failed to initialize connector [Connector[HTTP/1.1-8080]]
org.apache.catalina.LifecycleException: Failed to initialize component [Connector[HTTP/1.1-8080]]

And in the Bonita BPM Studio, I am no longer able to publish Organization or Reset engine and when I try it gives me this error message.

An error occurred while reseting engine.

Run has failed while undeploying the process
com.sun.proxy.$Proxy43.login(Unknown Source)
org.bonitasoft.studio.engine.BOSEngineManager.loginTenant(BOSEngineManager.java:294)
org.bonitasoft.studio.engine.BOSEngineManager.loginDefaultTenant(BOSEngineManager.java:274)
org.bonitasoft.studio.engine.operation.UndeployProcessOperation.undeployAll(UndeployProcessOperation.java:117)
org.bonitasoft.studio.engine.operation.UndeployProcessOperation.run(UndeployProcessOperation.java:92)
org.bonitasoft.studio.engine.command.ResetEngineCommand$1.run(ResetEngineCommand.java:51)
org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:122)

Now, if I connect to the portal manually by typing "http://localhost:8080/bonita", it's the HTTP Status 404 page.
What could be the problem, what would I be missing, and How can I fix these errors?