error message: "Error loading task list Cannot open calendar: Unexpected HTTP status code 4 returned"( CalDav )

[Artem Kazantsev]

Binary package hint: evolution

1) Cannot remove mis-configured calendar (CalDav)
2) Evolution main menu becomes unaccessible (don't drop down)

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: evolution 2.32.2-0ubuntu7
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: wl nvidia
Architecture: amd64
Date: Wed May 11 12:34:33 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/evolution
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110407.1)
ProcEnviron:
 SHELL=/bin/bash
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
SourcePackage: evolution
UpgradeStatus: No upgrade log present (probably fresh install)
XsessionErrors:
 (gnome-panel:6872): GConf-WARNING **: Directory `/apps/panel/toplevels/bottom_panel_screen1/screen' was not being monitored by GConfClient 0xa87700
 (gnome-panel:6872): GConf-WARNING **: Directory `/apps/panel/toplevels/top_panel_screen1/screen' was not being monitored by GConfClient 0xa87700
 (tracker-miner-fs:6880): Tracker-CRITICAL **: tracker_sparql_builder_object_string: assertion `literal != NULL' failed
 (tracker-miner-fs:6880): Tracker-CRITICAL **: tracker_sparql_builder_subject: assertion `((((tracker_sparql_builder_get_state (self) == TRACKER_SPARQL_BUILDER_STATE_INSERT) || (tracker_sparql_builder_get_state (self) == TRACKER_SPARQL_BUILDER_STATE_OBJECT)) || (tracker_sparql_builder_get_state (self) == TRACKER_SPARQL_BUILDER_STATE_EMBEDDED_INSERT)) || (tracker_sparql_builder_get_state (self) == TRACKER_SPARQL_BUILDER_STATE_DELETE)) || (tracker_sparql_builder_get_state (self) == TRACKER_SPARQL_BUILDER_STATE_WHERE)' failed
 (tracker-miner-fs:6880): Tracker-CRITICAL **: tracker_sparql_builder_predicate: assertion `((tracker_sparql_builder_get_state (self) == TRACKER_SPARQL_BUILDER_STATE_SUBJECT) || (tracker_sparql_builder_get_state (self) == TRACKER_SPARQL_BUILDER_STATE_OBJECT)) || (tracker_sparql_builder_get_state (self) == TRACKER_SPARQL_BUILDER_STATE_BLANK)' failed

[Thomas (thomas-pitrou)]

I've got the same error, I was able to delete the cal by selecting it then discard the error message. To remove the calendar go on Edit menu then Delete Calendar.