Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7e1601aa00d5bb72fd76095483d73845ebbfcbde0249f9caafef54ca56b3d93d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^