Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> af3fd34603e2ba7d29b664721687f2a559ce78b2f90d5aba0997114f58eb199b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^