24 lines
1.4 KiB
Markdown
24 lines
1.4 KiB
Markdown
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# Troubleshooting
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## Unmarshaling doesn't work
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The most common reason for this issue is improper use of struct tags (eg. `yaml` or `json`). Viper uses [github.com/mitchellh/mapstructure](https://github.com/mitchellh/mapstructure) under the hood for unmarshaling values which uses `mapstructure` tags by default. Please refer to the library's documentation for using other struct tags.
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## Cannot find package
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Viper installation seems to fail a lot lately with the following (or a similar) error:
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```
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cannot find package "github.com/hashicorp/hcl/tree/hcl1" in any of:
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/usr/local/Cellar/go/1.15.7_1/libexec/src/github.com/hashicorp/hcl/tree/hcl1 (from $GOROOT)
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/Users/user/go/src/github.com/hashicorp/hcl/tree/hcl1 (from $GOPATH)
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```
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As the error message suggests, Go tries to look up dependencies in `GOPATH` mode (as it's commonly called) from the `GOPATH`.
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Viper opted to use [Go Modules](https://github.com/golang/go/wiki/Modules) to manage its dependencies. While in many cases the two methods are interchangeable, once a dependency releases new (major) versions, `GOPATH` mode is no longer able to decide which version to use, so it'll either use one that's already present or pick a version (usually the `master` branch).
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The solution is easy: switch to using Go Modules.
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Please refer to the [wiki](https://github.com/golang/go/wiki/Modules) on how to do that.
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**tl;dr* `export GO111MODULE=on`
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