Got systax error "suddenly" - why?

Using J!3.9.8 Stable, php7.4.0alpha2, DB mysql / 5.5.5-10.3.11-MariaDB-1:10.3.11+maria~bionic
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I do not know since when I have this problem. because haven't used for more than 6 month. Yesterday I wanted to create a new form. but no chance.
I tried a solution explained in one of topics: Line 152 $tot = [] changed in $tot = array()...

but I have still error:

"0syntax error, unexpected 'Fn' (T_FN), expecting identifier (T_STRING) "
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Anyone who can help?
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Thank you in advance.
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Michael

Turn up your site's error reporting, and maybe even enable your site's debug, to show which file and line the error is coming from.

Here hardcopy of the mentioned error:
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(http://prntscr.com/oc5y7r)
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JROOT/administrator/components/com_chronoforms5/chronoforms/events/fn/fn.php:9 :


9 namespace GCore\Admin\Extensions\Chronoforms\Events\Fn;
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JROOT/administrator/components/com_chronoforms5/chronoforms/views/edit.php:1453

1453  $jseoptions[$type] = $class::$title;

JROOT/libraries/cegcore/libs/view.php:76
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 76 include($action_file);

JROOT/libraries/cegcore/libs/app_j.php:257
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 257 $view->renderView($this->action);

JROOT/libraries/cegcore/libs/app_j.php:444

 444 $x_app->dispatch(true);

JROOT/libraries/cegcore/joomla_gcloader.php:104
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 104 echo \GCore\Libs\AppJ::call($area, $extension, $controller, $action, $cont_vars);

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JROOT/administrator/components/com_chronoforms5/chronoforms5.php:17
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17 $output = new JoomlaGCLoader('admin', 'chronoforms5', 'chronoforms');

JROOT/libraries/src/Component/ComponentHelper.php:402
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 402 require_once $path;

JROOT/libraries/src/Component/ComponentHelper.php:377
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 377 $contents = static::executeComponent($path);

JROOT/libraries/src/Application/AdministratorApplication.php:101
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101 $contents = ComponentHelper::renderComponent($component);

JROOT/libraries/src/Application/AdministratorApplication.php:159
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 159 $this->dispatch();

JROOT/libraries/src/Application/CMSApplication.php:196
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 196 $this->doExecute();

JROOT/administrator/index.php:51
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51 $app->execute();

Hi MIchael,
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Please try dropping your PHP version back from 7.4 alpha to the current stable release of 7.3.7 and see if that resolves the error. I suspect that something has changed in 7.4 (but I can't see what that is).
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Bob

Hi,
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I upgraded from 7.3 to 7.4 and get the same error message. I have two instances. One in Joomla and one in WP. Only Joomla breaks. The form works on the customer side but not on the backend in Joomla.
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Werner