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org.xwiki.rendering.macro.MacroExecutionException: Failed to generate an image using PlantUML for content [@startuml

start
:Das ist nur ein Test
:Bewerbung
stop

@enduml]
 at wiki:xwiki//org.xwiki.contrib.plantuml.internal.PlantUMLMacro.executeSync(PlantUMLMacro.java:141)
 at wiki:xwiki//org.xwiki.contrib.plantuml.internal.PlantUMLBlockAsyncRenderer.execute(PlantUMLBlockAsyncRenderer.java:108)
 at org.xwiki.rendering.async.internal.block.AbstractBlockAsyncRenderer.render(AbstractBlockAsyncRenderer.java:157)
 at org.xwiki.rendering.async.internal.block.AbstractBlockAsyncRenderer.render(AbstractBlockAsyncRenderer.java:54)
 at org.xwiki.rendering.async.internal.AsyncRendererJob.runInternal(AsyncRendererJob.java:101)
 at org.xwiki.job.AbstractJob.runInContext(AbstractJob.java:246)
 at org.xwiki.job.AbstractJob.run(AbstractJob.java:223)
 at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
 at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
 at java.base/java.lang.Thread.run(Unknown Source)
Caused by: org.apache.hc.client5.http.ClientProtocolException: Target host is not specified
 at org.apache.hc.client5.http.impl.classic.InternalHttpClient.doExecute(InternalHttpClient.java:173)
 at org.apache.hc.client5.http.impl.classic.CloseableHttpClient.execute(CloseableHttpClient.java:123)
 at wiki:xwiki//org.xwiki.contrib.plantuml.internal.DefaultPlantUMLGenerator.outputImage(DefaultPlantUMLGenerator.java:72)
 at wiki:xwiki//org.xwiki.contrib.plantuml.internal.PlantUMLMacro.executeSync(PlantUMLMacro.java:138)
 ... 9 more
Caused by: org.apache.hc.core5.http.ProtocolException: Target host is not specified
 at org.apache.hc.client5.http.impl.routing.DefaultRoutePlanner.determineRoute(DefaultRoutePlanner.java:66)
 at org.apache.hc.client5.http.impl.classic.InternalHttpClient.determineRoute(InternalHttpClient.java:120)
 at org.apache.hc.client5.http.impl.classic.InternalHttpClient.doExecute(InternalHttpClient.java:158)
 ... 12 more