"Some errorrs occurred whilst installing the downloaded plugins" on valid install

[csnyulas]

Got this after updating SWRLTab to the latest version (1.0.0.beta-17)

This is basically the same as protegeproject/swrltab-plugin#16, which was closed as it was supposed to be fixed, but it still occurs for me in Protege 5.0.0, Build beta-24-SNAPSHOT.

Here is the exception on the console:

org.osgi.framework.BundleException: Unresolved constraint in bundle swrltab-plugin [32]: Singleton conflict.
    at org.apache.felix.framework.Felix.resolveBundleRevision(Felix.java:4002) ~[org.apache.felix.main.jar:na]
    at org.apache.felix.framework.Felix.startBundle(Felix.java:2045) ~[org.apache.felix.main.jar:na]
    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:976) ~[org.apache.felix.main.jar:na]
    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:963) ~[org.apache.felix.main.jar:na]
    at org.protege.editor.core.update.PluginInstaller.installPlugin(PluginInstaller.java:324) [protege-editor-core.jar:na]
    at org.protege.editor.core.update.PluginInstaller.install(PluginInstaller.java:101) [protege-editor-core.jar:na]
    at org.protege.editor.core.update.PluginInstaller.lambda$run$32(PluginInstaller.java:55) [protege-editor-core.jar:na]
    at org.protege.editor.core.update.PluginInstaller$$Lambda$135/1702322013.run(Unknown Source) [protege-editor-core.jar:na]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_40]

and here is the detailed log:

Level:       INFO
Time:        1457399531507
Message:     ----------------------- Downloading and Installing Plugin ----------------------

Level:       INFO
Time:        1457399531508
Message:     Downloading the SWRLTab plugin (Version 1.0.0.beta-17)

Level:       INFO
Time:        1457399531508
Message:     Downloading the SWRLTab plugin from: https://github.com/protegeproject/swrltab-plugin/releases/download/swrltab-plugin-1.0.0-beta-17/swrltab-plugin-1.0.0-beta-17.jar

Level:       INFO
Time:        1457399544555
Message:     The SWRLTab plugin has been downloaded to /tmp/swrltab7215247226595840510.jar

Level:       INFO
Time:        1457399544596
Message:     Copied the SWRLTab plugin to swrltab.jar in the plugins directory

Level:       INFO
Time:        1457399544597
Message:     Installing the SWRLTab plugin

Level:       ERROR
Time:        1457399544620
Message:     An error occurred whilst installing the SWRLTab plugin.  This error was caused because the version of this plugin (1.0.0.beta-17)was either missing some other components that are not installed or, more likely,it is not compatible with this version of Protégé.
org.osgi.framework.BundleException
StackTrace:  
    org.apache.felix.framework.Felix.resolveBundleRevision(Felix.java:4002)
    org.apache.felix.framework.Felix.startBundle(Felix.java:2045)
    org.apache.felix.framework.BundleImpl.start(BundleImpl.java:976)
    org.apache.felix.framework.BundleImpl.start(BundleImpl.java:963)
    org.protege.editor.core.update.PluginInstaller.installPlugin(PluginInstaller.java:324)
    org.protege.editor.core.update.PluginInstaller.install(PluginInstaller.java:101)
    org.protege.editor.core.update.PluginInstaller.lambda$run$32(PluginInstaller.java:55)
    org.protege.editor.core.update.PluginInstaller$$Lambda$135/1702322013.run(Unknown Source)
    java.lang.Thread.run(Thread.java:745)

Level:       INFO
Time:        1457399544627
Message: