Error codes / Anchor framework
InstructionMissing
Anchor framework · Custom(100) · 0x64
custom program error: 0x64
What it means
8-byte instruction discriminator not found.
What to do
Call a real instruction on this program — likely wrong instruction data or wrong program.
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, stale swap quote).
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.