Running the Step 15 command node --max-old-space-size=614400 ./node_modules/.bin/snarkjs fflonk setup TwitterVerifier.r1cs powersOfTau28_hez_final_25.ptau TwiteerVerifier.zkey on a circuit with roughly 7.5 million constraints (I'm recreating the ZKEmail proof of twitter circuit). I've replaced powersOfTau28_hez_final_25.ptau with powersOfTau28_hez_final_23.ptau and powersOfTau28_hez_final_24.ptau and I get the following error:

If instead I run the command: node --max-old-space-size=614400 ./node_modules/.bin/snarkjs plonk setup TwitterVerifier.r1cs powersOfTau28_hez_final_24.ptau TwiteerVerifier.zkey, I get the following error:

I'm running this on an AWS EC2 instance with 32vCPUs and 64GB of RAM. I don't understand why the fflonk command fails despite the circuit size being within the constraints of the ptau file. I also don't understand what the plonk command's error means, although it seems like it should be a memory issue?