Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3a22229db0e791535c2fac86b6a12190dec2967b94d6ca8576e00f704440cf9e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^