Hello @diana08, welcome to ConsenSys zkEVM community!
I tested what you’re mentioning here and it works once you add more zeroes to the amount of crUSDC you want to exchange, as the exchange ratio is very unbalanced and you will need to balance it through the amounts you want to exchange.
Some problem…until now
I had thıs problem sometımes and ı want to share my experience here https ://explorer.prealpha.zkevm.consensys.net/tx/0x2782e80618d0895c5b9a6aedbe6a6aef9e6d9c2bd341e8636128a99142ce8589
had error 4 times but after following @tuya instruction above. work smoothly