Anchor
ConstraintAccountIsNone
“A required account for the constraint is None”
A required account for the constraint is None. Anchor checked the AccountIsNone constraint on one of the instruction's accounts and the account did not satisfy it.
Common causes
- The account passed under the constrained name does not meet the
AccountIsNonerequirement declared in the#[account(...)]attribute. - The client was generated from an outdated IDL, so accounts are mapped to the wrong names.
How to fix it
- Read the program logs just before this error: Anchor prints
AnchorError caused by account: <name>with the left/right values when available. - Open the instruction's
#[derive(Accounts)]struct, find that account and satisfy the constraint.