Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8421a1ce9960e8dda736490cb02bcafcc740c31ca7317e8a6b81332eeb921673:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^