Error when adding query to JasperServer

[wisoo123]

Hi,

when I try to add an query via iReport 5.1 -> RepositoryNavigator/Reports/.../Add->Query, I always get the following error:
"1-jsexception.folder.not.found.at"
I tried different sql queries and datasources, the error is always the same.

In the messages.log file I found:

java.lang.Exception: 1 - jsexception.folder.not.found.at
at com.jaspersoft.ireport.jasperserver.ws.WSClient.putReportUnitResource(WSClient.java:570)
at com.jaspersoft.ireport.jasperserver.ws.WSClient.modifyReportUnitResource(WSClient.java:509)
at com.jaspersoft.ireport.jasperserver.ws.WSClient.addOrModifyResource(WSClient.java:463)
at com.jaspersoft.ireport.jasperserver.ui.resources.QueryDialog.jButtonSaveActionPerformed(QueryDialog.java:592)
at com.jaspersoft.ireport.jasperserver.ui.resources.QueryDialog.access$700(QueryDialog.java:41)
at com.jaspersoft.ireport.jasperserver.ui.resources.QueryDialog$8.actionPerformed(QueryDialog.java:447)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)

Does any know what I can do to avoid this error and add queries ton the JasperServer?

Thanks!