Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3c9b6adbddd9db579853d5e107f3b8a1a3309c5b09e902ecb4e94926a8aed68f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^