You have a idea ? or not because I don't view

FIN: Found thread using two objects. Second get. com.openexchange.pooling.PoolingException: Found thread using two objects. Second get. at java.lang.Thread.dumpThreads(Native Method) at java.lang.Thread.getStackTrace(Thread.java:1383) at com.openexchange.pooling.ReentrantLockPool.get(ReentrantLockPool.java:329) at com.openexchange.database.Database.get(Database.java:165) at com.openexchange.database.Database.get(Database.java:151) at com.openexchange.database.Database.get(Database.java:131) at com.openexchange.server.DBPool.pickup(DBPool.java:71) at com.openexchange.tools.oxfolder.OXFolderIteratorSQL.getAllVisibleFoldersIteratorOfModule(OXFolderIteratorSQL.java:897) at com.openexchange.tools.oxfolder.OXFolderIteratorSQL.getAllVisibleFoldersIteratorOfModule(OXFolderIteratorSQL.java:877) at com.openexchange.groupware.calendar.CalendarCommonCollection.getVisibleAndReadableFolderObject(CalendarCommonCollection.java:749) at com.openexchange.groupware.calendar.CalendarCommonCollection.getVisibleFolderSQLInString(CalendarCommonCollection.java:813) at com.openexchange.groupware.calendar.CalendarMySQL.getUserActiveAppointmentsRangeSQL(CalendarMySQL.java:394) at com.openexchange.groupware.calendar.CalendarSql.hasAppointmentsBetween(CalendarSql.java:113) at com.openexchange.ajax.request.AppointmentRequest.actionHas(AppointmentRequest.java:707) at com.openexchange.ajax.request.AppointmentRequest.action(AppointmentRequest.java:188) at com.openexchange.ajax.Appointment.doGet(Appointment.java:99) at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) at com.openexchange.ajax.AJAXServlet.service(AJAXServlet.java:399) at com.openexchange.ajax.SessionServlet.service(SessionServlet.java:138) at com.openexchange.ajax.PermissionServlet.service(PermissionServlet.java:86) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at com.openexchange.tools.ajp13.AJPv13Request.response(AJPv13Request.java:92) at com.openexchange.tools.ajp13.AJPv13RequestHandler.createResponse(AJPv13RequestHandler.java:363) at com.openexchange.tools.ajp13.AJPv13Connection.createResponse(AJPv13Connection.java:168) at com.openexchange.tools.ajp13.AJPv13Listener.run(AJPv13Listener.java:245) at java.lang.Thread.run(Thread.java:595)
GRAVE: SVL-0002 Category=8 Message=Exception while parsing JSON: "invalid value in attribute 'id' value 'null'". exceptionID=2011293307-25 SVL-0002 Category=8 Message=Exception while parsing JSON: "invalid value in attribute 'id' value 'null'". exceptionID=2011293307-25 at com.openexchange.ajax.parser.DataParser.checkInt(DataParser.java:253) at com.openexchange.ajax.request.ContactRequest.actionGet(ContactRequest.java:362) at com.openexchange.ajax.request.ContactRequest.action(ContactRequest.java:130) at com.openexchange.ajax.Contact.doGet(Contact.java:153) at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) at com.openexchange.ajax.AJAXServlet.service(AJAXServlet.java:399) at com.openexchange.ajax.SessionServlet.service(SessionServlet.java:138) at com.openexchange.ajax.PermissionServlet.service(PermissionServlet.java:86) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at com.openexchange.tools.ajp13.AJPv13Request.response(AJPv13Request.java:92) at com.openexchange.tools.ajp13.AJPv13RequestHandler.createResponse(AJPv13RequestHandler.java:363) at com.openexchange.tools.ajp13.AJPv13Connection.createResponse(AJPv13Connection.java:168) at com.openexchange.tools.ajp13.AJPv13Listener.run(AJPv13Listener.java:245) at java.lang.Thread.run(Thread.java:595)
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