I'm receiving the following error when submitting a form:

key() expects parameter 1 to be array, null given

I'm using the Blog skeleton. I used the Grav suggested frontmatter code but removed the Recaptur stuff, I wanted to get it working… Ha!

Filled in all the Form, email SMTP server guff (my own smtp site server info).
The form crashes with a Server error.

This is the form.md

---
title: Contact
form:
    name: contact-form
    fields:
        -
            name: name
            label: Name
            placeholder: 'Enter your name'
            autofocus: 'on'
            autocomplete: 'on'
            type: text
            validate:
                required: true
        -
            name: email
            label: Email
            placeholder: 'Enter your email address'
            type: text
            validate:
                rule: email
                required: true
        -
            name: message
            label: Message
            size: long
            placeholder: 'Enter your message'
            type: textarea
            validate:
                required: true
    buttons:
        -
            type: submit
            value: Submit
            classes: 'gdlr-button with-border excerpt-read-more'
    process:
        -
            email:
                from: '{{ config.plugins.email.from }}'
                to:
                    - '{{ config.plugins.email.from }}'
                    - '{{ form.value.email }}'
                subject: '[Feedback] {{ form.value.name|e }}'
                body: '{% include ''forms/data.html.twig'' %}'
        -
            save:
                fileprefix: feedback-
                dateformat: Ymd-His-u
                extension: txt
                body: '{% include ''forms/data.txt.twig'' %}'
            message: 'Thank you for your feedback!'
        - null
cache_enable: false
---

Here are the first few entries from the error log:

[2022-03-28 11:32:01] grav.CRITICAL: key() expects parameter 1 to be array, null given - Trace:

0 /home/micexcha/gmwit.com/system/src/Grav/Common/Debugger.php(843): Whoops\Run->handleError(2, 'key() expects p...', '/home/micexcha/...', 930)

1 [internal function]: Grav\Common\Debugger->deprecatedErrorHandler(2, 'key() expects p...', '/home/micexcha/...', 930, Array)

2 /home/micexcha/gmwit.com/user/plugins/form/classes/Form.php(930): key(NULL)

3 /home/micexcha/gmwit.com/user/plugins/form/form.php(280): Grav\Plugin\Form\Form->post()

Any advice on what to do is welcome. Please keep in mind I am VERY new to Grav so be clear about what to do, please don't assume I know where to look 🙂 Thanks

@MurrayG, The error is caused by the last action - null. As the error says, the server expects the key to be an array instead of null.

As @Karmalakas said, the formatting used is not consistent. The 'message' action will not work because of this. That action should also be an array entry.

-
   message: 'Thank you for your feedback!'

By the way I wonder why cache_enable: false is being used. Any particular reason?

@Karmalakas,

• The extra newline in the collection/array format doesn't make a difference. I agree it would be a tad cleaner without the extra newline.
  By the way, my personal preference would be:
  YAMLCopy

  fields:
  name:
    type: text
    label: Name
  email:
    type: text
    label: Email
  

• In single quoted strings the single quote character can be escaped by prefixing it with another single quote, basically doubling it.
  The following will are yield the same value:
  TXTCopy

  "a'b'c"    -- > a'b'c
  'a''b''c'  -- > a'b'c
  a'b'c      -- > a'b'c
  

  That does not hold for double quoted strings. because double quotes are parsed differently.

• I suspect the sample is taken from the docs Example: Contact Form where OP followed the link Page markdown file, copied the sample pointed at and made a few changes.

@pamtbaau:
In single quoted strings the single quote character can be escaped by prefixing it with another single quote, basically doubling it.

Oh, didn't know that. Is it YAML specific?

@Karmalakas, I'm not familiar with all existing languages, but it holds for YAML. See its specs: 7.3.2. Single-Quoted Style

The single-quoted style is specified by surrounding “ ' ” indicators. Therefore, within a single-quoted scalar, such characters need to be repeated.