Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 77ff9648b3a20823ba658481b1e1bbebdae3e3f190b3c4f54b990339fd2dbdbc:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^