Troubleshoot Errors

Diagnose and resolve common Algorand development errors.

Error Categories

Category	Common Causes	Reference
Contract Errors	Assert failures, opcode budget, invalid operations	contract-errors.md
Transaction Errors	Overspend, invalid params, group issues	transaction-errors.md

Quick Diagnosis Flow

1. Identify the error type from the message
2. Check the error code if present (e.g., pc=123)
3. Find the root cause using the reference docs
4. Apply the fix from the common solutions

Common Error Patterns

Logic Eval Error (Contract Failure)

logic eval error: assert failed pc=123

Cause: An assert statement in the smart contract evaluated to false.

Debug steps:

1. The pc=123 indicates the program counter where failure occurred
2. Use source maps to find the exact line in your code
3. Check the assertion condition and input values

Transaction Rejected

TransactionPool.Remember: transaction TXID: overspend

Cause: Sender account has insufficient balance for amount + fee.

Fix: Fund the sender account or reduce the transaction amount.

Opcode Budget Exceeded

logic eval error: dynamic cost budget exceeded

Cause: Contract exceeded the 700 opcode budget per app call.

Fix:

• Add more app calls to the group for additional budget (pooled)
• Optimize contract logic to reduce operations
• Split complex operations across multiple calls

Asset Not Opted In

asset ASSET_ID missing from ACCOUNT_ADDRESS

Cause: The receiving account hasn't opted into the asset.

Fix: Have the receiver opt in before transferring:

algorand.send.asset_opt_in(AssetOptInParams(
    sender=receiver_address,
    asset_id=asset_id,
))

How to Proceed

1. Find your error in the category references below
2. Understand the cause from the explanation
3. Apply the solution from the code examples

References

• Contract Errors - Smart contract and logic errors
• Transaction Errors - Transaction and account errors
• Debugging Guide
• Error Handling in AlgoKit Utils