Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 11d0403fc2a123916deb16ba05d706f97e4774674509859244f27f94e95ad750:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^