Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3f23a5329068b1dda67183d1340da19e1edc12d0f0b7d715db9957dd7bd7a5cf:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^