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1 # Troubleshooting |
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2 |
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3 ## Unmarshaling doesn't work |
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4 |
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5 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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6 |
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7 ## Cannot find package |
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8 |
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9 Viper installation seems to fail a lot lately with the following (or a similar) error: |
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10 |
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11 ``` |
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12 cannot find package "github.com/hashicorp/hcl/tree/hcl1" in any of: |
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13 /usr/local/Cellar/go/1.15.7_1/libexec/src/github.com/hashicorp/hcl/tree/hcl1 (from $GOROOT) |
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14 /Users/user/go/src/github.com/hashicorp/hcl/tree/hcl1 (from $GOPATH) |
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15 ``` |
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16 |
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17 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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18 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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19 |
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20 The solution is easy: switch to using Go Modules. |
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21 Please refer to the [wiki](https://github.com/golang/go/wiki/Modules) on how to do that. |
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22 |
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23 **tl;dr* `export GO111MODULE=on` |