crosscheck archivelog fails with validation failed for archived log

Problem Description
Whenever I run "crosscheck archivelog all" it failed with message "validation failed for archived log" like below.

RMAN> crosscheck archivelog all;
 
released channel: ORA_DISK_1
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=323 devtype=DISK
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_10/o1_mf_1_3_5bkc1o5q_.arc recid=6 stamp=697208725
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_10/o1_mf_1_4_5bkd60x4_.arc recid=7 stamp=697209883
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_10/o1_mf_1_5_5bkd78q9_.arc recid=8 stamp=697209922
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_10/o1_mf_1_6_5bkf2rwx_.arc recid=9 stamp=697210802
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_10/o1_mf_1_7_5blbdsqs_.arc recid=10 stamp=697240820
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_10/o1_mf_1_8_5blc2tvx_.arc recid=11 stamp=697241524
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_11/o1_mf_1_9_5bm1t7hk_.arc recid=12 stamp=697264802
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_11/o1_mf_1_10_5bmqwzr6_.arc recid=13 stamp=697287417
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_11/o1_mf_1_11_5bnjqg4n_.arc recid=14 stamp=697312840
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_11/o1_mf_1_12_5bnytoy5_.arc recid=15 stamp=697327280
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_12/o1_mf_1_13_5boplo7l_.arc recid=16 stamp=697351600
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_12/o1_mf_1_14_5bp6vv6w_.arc recid=17 stamp=697368277
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_12/o1_mf_1_15_5bpdtlfn_.arc recid=18 stamp=697374380
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_13/o1_mf_1_16_5br3nh19_.arc recid=19 stamp=697430505
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_13/o1_mf_1_17_5brvlghg_.arc recid=20 stamp=697455015
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_14/o1_mf_1_18_5btzdcv5_.arc recid=21 stamp=697524454
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_14/o1_mf_1_19_5bw0drf0_.arc recid=22 stamp=697558259
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_14/o1_mf_1_20_5bwvyksr_.arc recid=23 stamp=697586476
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_15/o1_mf_1_21_5bxmsqql_.arc recid=24 stamp=697610898
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_15/o1_mf_1_22_5bz0h5on_.arc recid=25 stamp=697656639
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_15/o1_mf_1_23_5bzjbvg2_.arc recid=26 stamp=697672884
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_16/o1_mf_1_24_5c0lgk9r_.arc recid=27 stamp=697707819
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_16/o1_mf_1_25_5c24o21l_.arc recid=28 stamp=697759227
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_17/o1_mf_1_26_5c30s9py_.arc recid=29 stamp=697788035
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_17/o1_mf_1_27_5c4s0wyy_.arc recid=30 stamp=697845623
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_18/o1_mf_1_28_5c5k0jrj_.arc recid=31 stamp=697870186
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_18/o1_mf_1_29_5c6z1g0p_.arc recid=32 stamp=697917319
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_18/o1_mf_1_30_5c7mqfl8_.arc recid=33 stamp=697938502
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_19/o1_mf_1_31_5c89jkhw_.arc recid=34 stamp=697960811
validation failed for archived log
archive log filename=/u01/app/oracle/archivelog/2009_09_19/o1_mf_1_32_5c9ggk5p_.arc recid=35 stamp=697998634
validation succeeded for archived log
archive log filename=/u01/app/oracle/archivelog/2009_12_02/o1_mf_1_343_5kdfc1sv_.arc recid=36 stamp=704560058
validation succeeded for archived log
archive log filename=/u01/app/oracle/archivelog/2009_12_02/o1_mf_1_344_5kdfy3pd_.arc recid=37 stamp=704560667
validation succeeded for archived log
archive log filename=/u05/archive/%t_%s_%r.arc1_345_697204983.dbf recid=38 stamp=704560901
validation succeeded for archived log
archive log filename=/u05/archive/1_346_697204983.dbf recid=39 stamp=704561258
validation succeeded for archived log
archive log filename=/u05/archive/1_347_697204983.dbf recid=40 stamp=704561835
validation succeeded for archived log
archive log filename=/u05/archive/1_348_697204983.dbf recid=41 stamp=704561992
validation succeeded for archived log
archive log filename=/u05/archive/1_349_697204983.dbf recid=42 stamp=704562987
validation succeeded for archived log
archive log filename=/u05/archive/1_350_697204983.dbf recid=43 stamp=704562987
validation succeeded for archived log
archive log filename=/u05/archive/1_351_697204983.dbf recid=44 stamp=704562992
validation succeeded for archived log
archive log filename=/u05/archive/1_352_697204983.dbf recid=45 stamp=704563257
validation succeeded for archived log
archive log filename=/u05/archive/1_353_697204983.dbf recid=46 stamp=704563321
validation succeeded for archived log
archive log filename=/u05/archive/1_354_697204983.dbf recid=47 stamp=704563408
validation succeeded for archived log
archive log filename=/u05/archive/1_355_697204983.dbf recid=48 stamp=704563434
validation succeeded for archived log
archive log filename=/u05/archive/1_356_697204983.dbf recid=49 stamp=704584836
validation succeeded for archived log
archive log filename=/u05/archive/1_357_697204983.dbf recid=50 stamp=704586204
validation succeeded for archived log
archive log filename=/u05/archive/1_358_697204983.dbf recid=51 stamp=704611511
validation succeeded for archived log
archive log filename=/u05/archive/1_359_697204983.dbf recid=52 stamp=704648675
validation succeeded for archived log
archive log filename=/u05/archive/1_360_697204983.dbf recid=53 stamp=704650176
validation succeeded for archived log
archive log filename=/u05/archive/1_361_697204983.dbf recid=54 stamp=704650675
validation succeeded for archived log
archive log filename=/u05/archive/1_362_697204983.dbf recid=55 stamp=704671244
validation succeeded for archived log
archive log filename=/u05/archive/1_363_697204983.dbf recid=56 stamp=704692487
validation succeeded for archived log
archive log filename=/u05/archive/1_364_697204983.dbf recid=57 stamp=704708839
validation succeeded for archived log
archive log filename=/u05/archive/1_365_697204983.dbf recid=59 stamp=704736263
validation succeeded for archived log
archive log filename=/u05/archive/1_366_697204983.dbf recid=58 stamp=704736262
validation succeeded for archived log
archive log filename=/u05/archive/1_367_697204983.dbf recid=60 stamp=704736266
validation succeeded for archived log
archive log filename=/u05/archive/1_368_697204983.dbf recid=61 stamp=704737398
Crosschecked 56 objects

Cause of the Problem
The problem happened because archive log file destination was changed or someone deleted the archive log files manually using OS commands.

Solution of the Problem
The solution is to delete the expired archive log files. So do following,
$ rman
RMAN> connect target /
RMAN> crosscheck archivelog all;
RMAN> delete expired archivelog all;

Catchable fatal error: Object of class WP_Error could not be converted to string

Problem Description
In the environment of
WPMU 2.9.2
BP 1.2.3
PHP 5.2.13
BuddyPress Groupblog 1.4.4
the buddypress groupblog accessing blog tab fails with error below.

Catchable fatal error: Object of class WP_Error could not be converted to string in /home/kunstfac/public_html/wp-includes/wp-db.php on line 488

The url will be like, http://{website_name}/groups/{group_name}/blog/

Cause of the problem
The problem happened due to bug of BuddyPress Groupblog version 1.4.4.

Solution of the problem
Since this is bug of this BuddyPress Groupblog 1.4.4 version so it is expected bug will be resolved in the next version of this plugin. However you can follow following workaround to make the plugin or blog section work.

The idea is don't create the group and groupblog at the same time.

Step 01: Visit the Site Admin > Blogs. Create a new Blog. Ensure that blog is created by visiting wp-admin/wpmu-blogs.php

Step 02: From the frontend after login as admin Create a group as usual but do not create a new groupblog. Instead at 3. Group Blog click the checkbox "Enable group blog" and then Use one of your own available blogs and from dropdown box select your blog.

Step 03: Go through next steps and you will see your blog is working perfect.