You are trying to integrate AvaTax with NetSuite but receive the following error
"An unexpected error occurred in a script running on this page.
AVA_ConfigWizardSave (saveRecord) customscript_avaconfig_client"
- In NetSuite go to Avalara > Setup > Configure Avalara
- Click 'Edit Credentials'
- Remove all existing values from fields i.e Account ID, License Key, Username and Password.
- Next, re-enter all the values afresh.
- Click the 'Validate' button and verify.