this issue is similar to CONF-31546 and CONF-30017:

I wanted to move a Confluence Page with a deep page hierarchy to another space.

After clicking on the "Verschieben" (german; in englisch: move) button, after a few seconds an error is displayed in the move dialog (see screenshot). I don't see any problem with the confluence pages: the page is moved correctly to the new space.

I send the log file in the attachments (atlassian-confluence.log) which ends with the error.
Notable log entries:

2014-07-03 10:52:38,128 WARN [scheduler_Worker-10] [atlassian.confluence.cache.TransactionalCacheFactory] warning Transactional cache update outside transaction. All updates to this cache should be performed from a thread with a valid transaction context.
...
2014-07-03 10:52:38,317 ERROR [scheduler_Worker-10] [officeconnector.index.excel.ExcelXMLTextExtractor] endDocument expected [ 176 ] entries but read [ 178 ]