Contract(create sale invoice error)

[BreytaUrban]

Hi i am currently facing an issue with the contract payment in ERP next. Whenever i try to click the create sales invoice button under the actions button on the top right, i get the following error code in the attachment (see attachment).what could be wrong

[morghim]

Thank you for using the app

did you add an account on contract type ?

Please show me your logs

[morghim]

need to setup account for item follow docs