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I saw this same error earlier here:
<https://pulumi-community.slack.com/archives/C84L4E3N1/p1558201564057000?thread_ts=1558193224.055800&amp;cid=C84L4E3N1>

However, I *am* running `pulumi up` and the error outputs:

```    error: Plan apply failed: Program run without the `pulumi` CLI; this may not be what you want (enable PULUMI_TEST_MODE to disable this error)
```

This started happening after I defined a new function as part of my custom resource

I'm using Pulumi `v0.17.16`

Any idea on a fix?