cannot find package

[Reezario]

Describe the bug
after running the GUI.py file, i can select all features and direct to Main.go. Once I hit run I receive errors that certain .go files "package not found" When I search for the github.com/luno/luno-go/decimal which the .go files call for i get an error saying page not found

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• Device: [MACBOOK AIR]
• OS: [macOS High Sierra 10.13.6]
• Browser [Chrome]
• Version [90.0.4430.93]

Additional context
Desktop/RTB/ETHena-master/src/go/utils/dataVisualisation.go:6:2: cannot find package
../../../../../../Desktop/RTB/ETHena-master/src/go/utils/apiutils.go:9:2: cannot find package
../../../../../../Desktop/RTB/ETHena-master/src/go/backtestingUtils/historical.go:4:2: cannot find package
../../../../../../Desktop/RTB/ETHena-master/src/go/utils/apiutils.go:10:2: no required module provides package github.com/luno/luno-go/decimal: go.mod file not found in current directory or any parent directory; see 'go help modules'
../../../../../../Desktop/RTB/ETHena-master/src/go/backtestingUtils/historical.go:5:2: cannot find package
../../../../../../Desktop/RTB/ETHena-master/src/go/utils/email.go:5:2: cannot find package