Error codes / Anchor framework
InstructionMissing
Anchor framework · Custom(100) · 0x64
custom program error: 0x64
What it means
The program has no instruction with this 8-byte discriminator: the client was built against a different version of the program, or sent its data to the wrong program.
What to do
Regenerate the client from the program's current IDL and check the program ID it targets.
Have the transaction that failed with this?
Paste its signature. TxWhy shows the exact instruction and inner call that raised the error, and rebuilds the transaction when the cause is one it can fix (compute limit, expired blockhash, priority fee, a stale swap quote or a moved limit).
Code 100 means something else in other programs
Custom codes are private to each program. Check which program actually raised it: it is the innermost failed call, not necessarily the program you called.