please see second error : Template /info/magnolia/module/admininterface/pages/ExportPageError.html not found

Happend on new (custom) workspace in magnolia repository when exporting to XML as superuser. Not sure why first error occurs, but could be my fault.

ERROR info.magnolia.cms.servlets.MVCServletHandlerImpl MVCServletHandlerImpl.java(execute:99) 07.02.2007 08:16:56 can't call command: exportxml
javax.servlet.ServletException: Write permission needed for export. User not allowed to WRITE path [/]
at info.magnolia.module.admininterface.pages.ExportPage.exportxml(ExportPage.java:207)
[...]
ERROR info.magnolia.cms.util.FreeMarkerUtil FreeMarkerUtil.java(process:137) 07.02.2007 08:16:56 exception in template
java.io.FileNotFoundException: Template /info/magnolia/module/admininterface/pages/ExportPageError.html not found.
at freemarker.template.Configuration.getTemplate(Configuration.java:488)
at freemarker.template.Configuration.getTemplate(Configuration.java:451)
at info.magnolia.cms.util.FreeMarkerUtil.process(FreeMarkerUtil.java:127)
at info.magnolia.module.admininterface.TemplatedMVCHandler.renderHtml(TemplatedMVCHandler.java:79)
at info.magnolia.module.admininterface.pages.ExportPage.renderHtml(ExportPage.java:277)
at info.magnolia.cms.servlets.MVCServlet.doPost(MVCServlet.java:112)
at info.magnolia.cms.servlets.MVCServlet.doGet(MVCServlet.java:48)
[...]