hello odoo community

I am using OpenERP v6 and  I have an error when I want to open some analytic accounts from accounting>configuration>analytic accounting > analytic accounts

"OperationalError: could not write block 64390 of temporary file: No space left on device

HINT:  Perhaps out of disk space?"

 I search for this error and  I found it's related to PostgreSQL "\https://stackoverflow.com/questions/21542550/why-does-postgresql-prompt-error-perhaps-out-of-disk-space-while-there-is-enou "

I do not understand why it's happened for some of them, not all of them and why this happened? and how to solve this?

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I get the log of Postgresql and in error case :

bad query: SELECT account_analytic_analysis_summary_user."user",
account_analytic_analysis_summary_user."unit_amount",
account_analytic_analysis_summary_user.id
FROM "account_analytic_analysis_summary_user"
WHERE account_analytic_analysis_summary_user.id IN (197004)
ORDER BY user

but in normal case:

SELECT DISTINCT("user")
FROM account_analytic_analysis_summary_user
WHERE account_id IN (272) AND unit_amount <> 0.0

can anyone help me why this happened?