Error after upgrade to 7.1.3

I upgraded a TeamCity 7.0.1 server to 7.1.3 this morning, but got the following error at the end of the install, which now prevents the server from starting:

Could not create the main application servlet: Error creating bean with name 'artefactsViewPopupController' defined in URL [jar:file:/C:/TEAMCITY/webapps/ROOT/WEB-INF/lib/artefacts.jar!/META-INF/build-server-plugin.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [jetbrains.buildServer.controllers.ViewArtifactsPopupController]: Constructor threw exception; nested exception is java.lang.IllegalStateException: Cannot map handler of type [class jetbrains.buildServer.controllers.ViewArtifactsPopupController] to URL path [/httpAuth/viewArtifactsPopup.html]: There is already handler of type [class jetbrains.buildServer.controllers.artifacts.ViewArtifactsPopupController] mapped.

Can someone explain what this error means an how I can fix it?

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