Unable to delete sub task created or change the sub task to other option (Story)

[kmodipzone]

Hi,

We are facing the problem with following.

1) Getting error when we tried to delete the sub task.

com.atlassian.greenhopper.manager.lexorank.LexoRankIntegrityException: Expected exactly 2 rows; the maximum marker row and the lowest ranked row for rank field[id=10005]

com.atlassian.greenhopper.manager.lexorank.LexoRankIntegrityException: Expected exactly 2 rows; the maximum marker row and the lowest ranked row for rank field[id=10005]
	at com.atlassian.greenhopper.manager.lexorank.LexoRankDaoImpl.getMaximumMarkerRowAndPreviousRow(LexoRankDaoImpl.java:399) [?:?]
	at com.atlassian.greenhopper.service.lexorank.LexoRankOperation.rankInitially(LexoRankOperation.java:180) [?:?]
	at com.atlassian.greenhopper.service.lexorank.LexoRankOperation.execute(LexoRankOperation.java:119) [?:?]
	at com.atlassian.greenhopper.manager.lexorank.LexoRankManagerImpl.performRankOperation(LexoRankManagerImpl.java:300) [?:?]
	at com.atlassian.greenhopper.manager.lexorank.LexoRankManagerImpl.getRankOrRankInitially(LexoRankManagerImpl.java:86) [?:?]
	at com.atlassian.greenhopper.customfield.lexorank.L

2) Getting error when we tried to change the sub task to story. [Converting issue]

Sorry, we had some technical problems during your last operation.

[Nic Brough -Adaptavist-]

This is usually caused by bugs or dodgy data in upgrades.

Work through https://confluence.atlassian.com/jirakb/cannot-reindex-jira-due-to-expected-exactly-2-rows-the-maximum-marker-row-and-the-lowest-ranked-row-for-rank-field-779158916.html to fix it.