Error message

I would greatly appreciate some help. I was trying to get rid of comments box and change text add comments here on the payment method page.
I was able to get rid of text box and change "add comments here" to "thank you for your order". I am running Opencart 3.0.2.

However now I get an error message. I attached a picture of the error. Its happens when you click the continue button on the payment methods page.
The only two files I have been in is the payment methods twig file and the check out php file. So does anyone know what happened here?
I did cleared cache and tried a different browser. Still get same message. Below is the php checkout file code, and the payment method twig, plus the error message.
Thanks!!

<?php
// Heading
$_['heading_title'] = 'Checkout';

// Text
$_['text_cart'] = 'Shopping Cart';
$_['text_checkout_option'] = 'Step %s: Checkout Options';
$_['text_checkout_account'] = 'Step %s: Account &amp; Billing Details';
$_['text_checkout_payment_address'] = 'Step %s: Billing Details';
$_['text_checkout_shipping_address'] = 'Step %s: Delivery Details';
$_['text_checkout_shipping_method'] = 'Step %s: Delivery Method';
$_['text_checkout_payment_method'] = 'Step %s: Payment Method';
$_['text_checkout_confirm'] = 'Step %s: Confirm Order';
$_['text_modify'] = 'Modify &raquo;';
$_['text_new_customer'] = 'New Customer';
$_['text_returning_customer'] = 'Returning Customer';
$_['text_checkout'] = 'Checkout Options:';
$_['text_i_am_returning_customer'] = 'I am a returning customer';
$_['text_register'] = 'Register Account';
$_['text_guest'] = 'Guest Checkout';
$_['text_register_account'] = 'By creating an account you will be able to shop faster, be up to date on an order\'s status, and keep track of the orders you have previously made.';
$_['text_forgotten'] = 'Forgotten Password';
$_['text_your_details'] = 'Your Personal Details';
$_['text_your_address'] = 'Your Address';
$_['text_your_password'] = 'Your Password';
$_['text_agree'] = 'I have read and agree to the <a href="%s" class="agree"><b>%s</b></a>';
$_['text_address_new'] = 'I want to use a new address';
$_['text_address_existing'] = 'I want to use an existing address';
$_['text_shipping_method'] = 'Please select the preferred shipping method to use on this order.';
$_['text_payment_method'] = 'Please select the preferred payment method to use on this order.';
$_['text_comments'] = 'Thank you for your order';
$_['text_recurring_item'] = 'Recurring Item';
$_['text_payment_recurring'] = 'Payment Profile';
$_['text_trial_description'] = '%s every %d %s(s) for %d payment(s) then';
$_['text_payment_description'] = '%s every %d %s(s) for %d payment(s)';
$_['text_payment_cancel'] = '%s every %d %s(s) until canceled';
$_['text_day'] = 'day';
$_['text_week'] = 'week';
$_['text_semi_month'] = 'half-month';
$_['text_month'] = 'month';
$_['text_year'] = 'year';

// Column
$_['column_name'] = 'Product Name';
$_['column_model'] = 'Model';
$_['column_quantity'] = 'Quantity';
$_['column_price'] = 'Unit Price';
$_['column_total'] = 'Total';

// Entry
$_['entry_email_address'] = 'E-Mail Address';
$_['entry_email'] = 'E-Mail';
$_['entry_password'] = 'Password';
$_['entry_confirm'] = 'Password Confirm';
$_['entry_firstname'] = 'First Name';
$_['entry_lastname'] = 'Last Name';
$_['entry_telephone'] = 'Telephone';
$_['entry_address'] = 'Choose Address';
$_['entry_company'] = 'Company';
$_['entry_customer_group'] = 'Customer Group';
$_['entry_address_1'] = 'Address 1';
$_['entry_address_2'] = 'Address 2';
$_['entry_postcode'] = 'Post Code';
$_['entry_city'] = 'City';
$_['entry_country'] = 'Country';
$_['entry_zone'] = 'Region / State';
$_['entry_newsletter'] = 'I wish to subscribe to the %s newsletter.';
$_['entry_shipping'] = 'My delivery and billing addresses are the same.';

// Error
$_['error_warning'] = 'There was a problem while trying to process your order! If the problem persists please try selecting a different payment method or you can contact the store owner by <a href="%s">clicking here</a>.';
$_['error_login'] = 'Warning: No match for E-Mail Address and/or Password.';
$_['error_attempts'] = 'Warning: Your account has exceeded allowed number of login attempts. Please try again in 1 hour.';
$_['error_approved'] = 'Warning: Your account requires approval before you can login.';
$_['error_exists'] = 'Warning: E-Mail Address is already registered!';
$_['error_firstname'] = 'First Name must be between 1 and 32 characters!';
$_['error_lastname'] = 'Last Name must be between 1 and 32 characters!';
$_['error_email'] = 'E-Mail address does not appear to be valid!';
$_['error_telephone'] = 'Telephone must be between 3 and 32 characters!';
$_['error_password'] = 'Password must be between 4 and 20 characters!';
$_['error_confirm'] = 'Password confirmation does not match password!';
$_['error_address_1'] = 'Address 1 must be between 3 and 128 characters!';
$_['error_city'] = 'City must be between 2 and 128 characters!';
$_['error_postcode'] = 'Postcode must be between 2 and 10 characters!';
$_['error_country'] = 'Please select a country!';
$_['error_zone'] = 'Please select a region / state!';
$_['error_agree'] = 'Warning: You must agree to the %s!';
$_['error_address'] = 'Warning: You must select address!';
$_['error_shipping'] = 'Warning: Shipping method required!';
$_['error_no_shipping'] = 'Warning: No Shipping options are available. Please <a href="%s">contact us</a> for assistance!';
$_['error_payment'] = 'Warning: Payment method required!';
$_['error_no_payment'] = 'Warning: No Payment options are available. Please <a href="%s">contact us</a> for assistance!';
$_['error_custom_field'] = '%s required!';

Payment method TWIG FILE
{% if error_warning %}
<div class="alert alert-warning alert-dismissible"><i class="fa fa-exclamation-circle"></i> {{ error_warning }}</div>
{% endif %}
{% if payment_methods %}
<p>{{ text_payment_method }}</p>
{% for payment_method in payment_methods %}
<div class="radio">
<label>{% if payment_method.code == code or not code %}
{% set code = payment_method.code %}
<input type="radio" name="payment_method" value="{{ payment_method.code }}" checked="checked" />
{% else %}
<input type="radio" name="payment_method" value="{{ payment_method.code }}" />
{% endif %}
{{ payment_method.title }}
{% if payment_method.terms %}
({{ payment_method.terms }})
{% endif %} </label>
</div>
{% endfor %}
{% endif %}
<p><strong>{{ text_comments }}</strong></p>
<p>
<textarea name="comment" cols="10 rows="8">.....</textarea>
</p>
{% if text_agree %}
<div class="buttons">
<div class="pull-right">{{ text_agree }}
{% if agree %}
<input type="checkbox" name="agree" value="1" checked="checked" />
{% else %}
<input type="checkbox" name="agree" value="1" />
{% endif %}
&nbsp;
<input type="button" value="{{ button_continue }}" id="button-payment-method" data-loading-text="{{ text_loading }}" class="btn btn-primary" />
</div>
</div>
{% else %}
<div class="buttons">
<div class="pull-right">
<input type="button" value="{{ button_continue }}" id="button-payment-method" data-loading-text="{{ text_loading }}" class="btn btn-primary" />
</div>
</div>
{% endif %}

Long time reported issue. In catalog/controller/checkout/payment_method.php and catalog/controller/checkout/shipping_method.php file,

find:
replace with:
Then, ensure to apply these steps: viewtopic.php?f=176&p=727490#p718325

This should resolved the issue. In addition, you do not need to post the entire files to rectify one problem.

I believe I did what you instructed. Now I have an internal server error. I also cleared cache and refreshed as directed.
Any thoughts?

I attached a picture of the code from the last part of the file with the changes starting with line 353.
I must have some out of place . Thank-you as well.

For unknown reasons, the last closing bracket did not appeared since the last time I submitted the post. Try again, it should work now.

Thank-you. We are getting closer. The cart functions fine however when you click on continue on the payment methods page it goes back to first check out page.
I attached the file image, just in case I misses something. Any thoughts?

Ok, problem solved! All my problems started with removing comments box on the payment page of check out. Opencart support suggested that I just remove that code to remove the comments box. However, that apparently created my problem. I reached out to Opencart support again and was told to restore my comment box, but add ​style="display: none"​to hide it because the controller expects it. Then I restored the catalog/controller/checkout/payment_method.php file to its original code. After that everything worked just fine.

I wanted to publicly thank straightlight for his help. Thanks!!