Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8f6d5bd9d8c59b30c193772c37ee825ef3fea5d40cb6426e31b2fc3813da0e9f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^