"Transaction simulation failed: Attempt to load a program that does not exist"

External question — Solana Stack Exchange Author: rtwhite Original post: https://solana.stackexchange.com/questions/16185 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. Trying to create an NFT collection using metaplex and have been getting stuck with this error while trying to interact with the program using a nextjs client. Here is the repo https://github.com/rtwhite10/token_2022_nft I have seen that this error is usually related to testnet not having metaplex programs available but im testing using devnet so im a little confused. Wondering if it has something to do with the program call here ? I have two programs that are very similar mint-nft which uses token-2022 and also mint-nft-standard which does not. Both are returning the same error. I created the standard as I was thinking it could be related to my token 2022 implementation in both theses programs mint_nft.rs & create_collection.rs full error { "jsonrpc": "2.0", "error": { "code": -32002, "message": "Transaction simulation failed: Attempt to load a program that does not exist", "data": { "accounts": null, "err": "ProgramAccountNotFound", "innerInstructions": null, "logs": [], "replacementBlockhash": null, "returnData": null, "unitsConsumed": 0 } }, "id": "a00cf2f3-e149-4f25-b632-61a2604bdfe6" } Thanks!

External answer — Solana Stack Exchange Author: rtwhite Original post: https://solana.stackexchange.com/a/16193 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. I figured it out, this was because my program was not deployed correctly. I somehow deployed it previously but the address was not the same as the one found in the IDL for the program. Re-deployed and now the error is gone. But I have a new error... hahaha