An error has occured : java.lang.ArrayIndexOutOfBoundsException: Index -262 out of bounds for length 640 Fr The greatest enemy of knowledge is not ignorance; it is the illusion of knowledge Th Fr Sa Su Mo Tu We Th 13 14 15 16 17 18 19 20 21 22 23 24 25 26 PlantUML (1.2026.3beta4) has crashed. Diagram size: 9 lines / 347 characters. Java Runtime: OpenJDK Runtime Environment JVM: OpenJDK 64-Bit Server VM Default Encoding: UTF-8 Language: en Country: US PLANTUML_LIMIT_SIZE: 4096 You should send this diagram and this image to plantuml@gmail.com or post to https://plantuml.com/qa to solve this issue. You can try to turn around this issue by simplifing your diagram. java.lang.ArrayIndexOutOfBoundsException: Index -262 out of bounds for length 640 net.sourceforge.plantuml.asciiart.BasicCharAreaImpl.drawChar(BasicCharAreaImpl.java:74) net.sourceforge.plantuml.asciiart.BasicCharAreaImpl.drawStringLR(BasicCharAreaImpl.java:126) net.sourceforge.plantuml.klimt.drawing.txt.UGraphicTxt.draw(UGraphicTxt.java:89) net.sourceforge.plantuml.klimt.drawing.AbstractUGraphicHorizontalLine.draw(AbstractUGraphicHorizontalLine.java:77) net.sourceforge.plantuml.klimt.creole.legacy.AtomText.drawU(AtomText.java:162) net.sourceforge.plantuml.klimt.creole.SheetBlock1.drawU(SheetBlock1.java:215) net.sourceforge.plantuml.klimt.creole.SheetBlock2.drawU(SheetBlock2.java:106) net.sourceforge.plantuml.project.draw.TaskDrawRegular.drawTitle(TaskDrawRegular.java:121) net.sourceforge.plantuml.project.GanttDiagramMainBlock.drawTasksTitle(GanttDiagramMainBlock.java:185) net.sourceforge.plantuml.project.GanttDiagramMainBlock.drawU(GanttDiagramMainBlock.java:121) net.sourceforge.plantuml.klimt.shape.TextBlockUtils$2.drawU(TextBlockUtils.java:156) net.sourceforge.plantuml.core.TextBlockExporter12026.exportTo(TextBlockExporter12026.java:172) net.sourceforge.plantuml.UgDiagram.exportDiagram(UgDiagram.java:92) net.sourceforge.plantuml.servlet.DiagramResponse.sendDiagram(DiagramResponse.java:159) net.sourceforge.plantuml.servlet.UmlDiagramService.doGet(UmlDiagramService.java:106) javax.servlet.http.HttpServlet.service(HttpServlet.java:529) javax.servlet.http.HttpServlet.service(HttpServlet.java:623) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:197) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:142) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:166) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:142) org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:166) org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:88) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481) org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:83) org.apache.catalina.valves.StuckThreadDetectionValve.invoke(StuckThreadDetectionValve.java:185) org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:72) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:398) org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:935) org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1831) org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:973) org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:491) org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63) java.base/java.lang.Thread.run(Thread.java:829) Diagram source: (Use http://zxing.org/w/decode.jspx to decode the qrcode)