Unable to backup tables in Oracle 10g

hi,
I am faced with the following error when trying to take backup:
Validation Error
Examine and correct the following errors, then retry the operation:
Error - ERROR: Wrong password for user
Export: Export Type
Even i tried with SYS user.

Hi,
Do you talking about OEM Database Console ?
On the Export Type page, select the type of export you want to perform. You can select Database, Schema, or Table and then enter credentials in the[b] Host Username and Host Password fields.
Cheers

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