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

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.

 

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