Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1b6b663ddbbc49ffcbd06b3745403d6e5bf36b1b3c34a6699856c0fd2b611473:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^