ACP - Portal Modules [phpBB Debug]PHP Warning

[Harewood]

Hi,
I get the following error at the top of the ACP _ Portal Modules page when trying to Edit a Module:

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[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions_content.php on line 789: A non-numeric value encountered
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions_content.php on line 790: A non-numeric value encountered
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions_content.php on line 791: A non-numeric value encountered
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions_acp.php on line 138: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3037)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions_acp.php on line 138: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3037)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions_acp.php on line 138: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3037)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions_acp.php on line 138: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3037)

All works fine, but would like to fix... any help appreciated.

Using:
php ver 7.1.33
phpBB ver 3.3.0

[Kirk]

Hi
What phpBB and PHP version are you using?

[Harewood]

Hi Kirk,
I`m using:

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PHP version:	7.1.33
Board version:	3.3.0 

In addition I`ve just found that I cannot login to the forum using the Portal Logon box, I get the following error message:

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The submitted form was invalid. Try submitting again.

[Kirk]

Take this customized version of me, link in my signature. Uninstall the portal first.

[Harewood]

Thank you..