[Ethereum] Remix IDE getting VM error invalid opcode

This line in createNFT is the problem:

farmersHistoryViewable[msg.sender].weightByBatch[0][farmersHistoryViewable[msg.sender].totalBatches] = _weight;

farmersHistoryViewable maps addresses to structs of type farmersHistory:

struct farmersHistory {
    uint totalBatches;
    uint256 totalWeight;
    uint[1][] weightByBatch;
}

weightByBatch is really strange... it's a dynamic array of 1-length arrays. (What's the purpose of a 1-length array?)

In any case, weightByBatch[0] is always going to fail, since the array always has length zero. (Nothing in the code ever adjusts its length.)

This replacement sort of works, but it's unclear to me what you're trying to do, so I don't know if it accomplishes your goals. (It seems likely that you want to get rid of the second dimension of the array altogether.)

farmersHistoryViewable[msg.sender].weightByBatch.push([_weight]);
farmersHistoryViewable[msg.sender].totalBatches = farmersHistoryViewable[msg.sender].totalBatches.add(1);

(The second line of code is because your existing code didn't actually add one to totalBatches. It computed the result of adding one but then discarded it.)

There are other issues here: notably, you create a token with the ID from nft.totalSupply(), but then everything else you store is keyed off of the new value of nft.totalSupply() (which has increased in the call to mint). So your IDs are going to be mismatched between the nft contract and the agService instance.

Mined failed might be happen below conditions:

1. Might be low gas, because your method is required more gas,
   • Resolve:
     • All ways pass gas along with transaction. Don't leave to default gas, your method may require more gas to execute that method.
     • Don't hard code gas, because its depends on your input
     • Use estimateGas() function before execute call direct method. Then provide extra 10-20% gas.
2. Method is revert or assert() failed condition is failed.
   • Resolve: Write test cases and run those before deploy contract on mainnet.

Can you provide us transaction hash or code