Installed myopenhab for OH2 via PaperUI and now I get Error 500

[info2 (HestiaPi)]

I installed OH2 via apt-get on RasPi 3 and it has been working fine for a month or so.
As the title says, I installed myopenhab via PaperUI (under Misc I think), did nothing else, and now I get HTTP Error 500 on http://[RasPiIP]:8080 after it gets redirected to http://[RasPiIP]:8080/start/index.
uuid and secret file exist with the 2 strings in them, even created my account on myopenhab in case this matters but no change.
Restarted RasPi, service or manually run sudo /usr/share/openhab2/start_debug.sh with no effect. I then removed myopenhab from HABmin and again no change. Finally I did an apt-get update and upgrade (there was an upgrade available and installed successfully) as advised in another topic but again no change

http://[RasPiIP]:8080/start/index shows this:

HTTP ERROR 500

Problem accessing /start/index. Reason:

    Server Error
Caused by:

java.lang.NullPointerException
	at java.lang.String.replace(String.java:2240)
	at org.openhab.ui.dashboard.internal.DashboardServlet.serveDashboard(DashboardServlet.java:78)
	at org.openhab.ui.dashboard.internal.DashboardServlet.doGet(DashboardServlet.java:67)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)
	at org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:71)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
	at org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:287)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:80)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
	at org.eclipse.jetty.server.Server.handle(Server.java:499)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
	at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
	at java.lang.Thread.run(Thread.java:745)

Running sudo /usr/share/openhab2/start_debug.sh I get this only when I request the said URL:

23:20:38.182 [WARN ] [eclipse.jetty.servlet.ServletHandler] - /start/index
java.lang.NullPointerException
        at java.lang.String.replace(String.java:2240)[:1.8.0_65]
        at org.openhab.ui.dashboard.internal.DashboardServlet.serveDashboard(DashboardServlet.java:78)[168:org.openhab.ui.dashboard:2.0.0.201701021217]
        at org.openhab.ui.dashboard.internal.DashboardServlet.doGet(DashboardServlet.java:67)[168:org.openhab.ui.dashboard:2.0.0.201701021217]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)[19:javax.servlet-api:3.1.0]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)[19:javax.servlet-api:3.1.0]
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)[79:org.eclipse.jetty.servlet:9.2.19.v20160908]
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)[79:org.eclipse.jetty.servlet:9.2.19.v20160908]
        at org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:71)[170:org.ops4j.pax.web.pax-web-jetty:4.3.0]
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)[78:org.eclipse.jetty.server:9.2.19.v20160908]
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)[77:org.eclipse.jetty.security:9.2.19.v20160908]
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)[78:org.eclipse.jetty.server:9.2.19.v20160908]
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)[78:org.eclipse.jetty.server:9.2.19.v20160908]
        at org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:287)[170:org.ops4j.pax.web.pax-web-jetty:4.3.0]
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)[79:org.eclipse.jetty.servlet:9.2.19.v20160908]
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)[78:org.eclipse.jetty.server:9.2.19.v20160908]
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)[78:org.eclipse.jetty.server:9.2.19.v20160908]
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)[78:org.eclipse.jetty.server:9.2.19.v20160908]
        at org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:80)[170:org.ops4j.pax.web.pax-web-jetty:4.3.0]
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)[78:org.eclipse.jetty.server:9.2.19.v20160908]
        at org.eclipse.jetty.server.Server.handle(Server.java:499)[78:org.eclipse.jetty.server:9.2.19.v20160908]
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)[78:org.eclipse.jetty.server:9.2.19.v20160908]
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)[78:org.eclipse.jetty.server:9.2.19.v20160908]
        at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)[70:org.eclipse.jetty.io:9.2.19.v20160908]
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)[81:org.eclipse.jetty.util:9.2.19.v20160908]
        at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)[81:org.eclipse.jetty.util:9.2.19.v20160908]
        at java.lang.Thread.run(Thread.java:745)[:1.8.0_65]

Can you spot what may be the problem?

[splatch (Łukasz Dywicki)]

Please check this topic: Server Error / 500 with openhab2.

[info2 (HestiaPi)]

Thanks! I did that, so I tried doing it again and I get the following on the apt-get update:

W: Failed to fetch https://openhab.ci.cloudbees.com/job/openHAB-Distribution/ws/distributions/openhab-online/target/apt-repo/Packages  HttpError404

so maybe I am not actually upgrading anything.
My (cached) package is this openhab2-online (2.0.0~20170102133144)

[splatch (Łukasz Dywicki)]

Sorry to hear your troubles. There are packaging changes and no more online/offline separation. Please check following topic:

A single distro from now on!

And the changes are now available for apt-get users! Remember if you haven’t done so already make sure you change to the Bintray Repo as @theo has explained. Install As always, be sure to take a backup! but all you need to do is install using the new package name. This will automatically uninstall openhab2-online or openhab2-offline and replace it with this version: sudo apt-get update sudo apt-get install openhab2 Note: Sometimes, the installation would ask you if you would like to replace …

[info2 (HestiaPi)]

Thanks splatch! That is definitely one reason for my update not to work Will try tonight when I get home.

[info2 (HestiaPi)]

Thanks splatch! You are absolutely right! Your link did the trick.