Add What Could Possibly Go Wrong to import instruments vignette

[RaymondBalise]

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If you see:

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Error in inherits(ds, "data.frame") : object 'ds' not found

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You likely have a problem in the web-address/URL. Make sure you have included the http:// at the beginning and /api/ at the end. It is easy to forget the / after api.

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Error in REDCapR::redcap_metadata_read(redcap_uri = url, token = token) : 
  Assertion on 'token' failed: Must comply to pattern '^.{1,}$'.

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tidyREDCap can't find the name of the API key in your .Renviron file. Check for inconsistency (a typo) between the two places where the name is typed.

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Error in sanitize_token(token) : 
  The token is not a valid 32-character hexademical value.

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The API key is invalid. Try to copy and paste it again. Restart R.

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Error in \`pull()`:
! \`!!enquo(var)` must select exactly one column.
Run \`rlang::last_error()` to see where the error occurred.

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The API key is not associated with a REDCap project. Try to copy and paste it again. Restart R.
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