Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 87e6754ac479403d275b32111f6bde05da5dc0aeb8bda66ec9b9cc710eb2c390:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^