It seems to be the field plugin (i will renew my account as soon as possible)
Here is the message with debug mode :
htmlspecialchars(): Argument #1 ($string) must be of type string, array given
/home/nfrqepxx/.../2023test/layouts/joomla/form/field/text.php:82
And here the code of the file
78 <input type="text" name="<?php
79 echo $name; ?>" id="<?php
80 echo $id; ?>" <?php
81 echo $dirname; ?> value="<?php
82 echo htmlspecialchars($value, ENT_COMPAT, 'UTF-8'); ?>" <?php echo implode(' ', $attributes); ?> />
83 <?php if ($options) : ?>
84 <datalist id="<?php echo $id; ?>_datalist">
85 <?php foreach ($options as $option) : ?>
86 <?php if (!$option->value) : ?>
87 <?php continue; ?>
88 <?php endif; ?>
89 <option value="<?php echo $option->value; ?>"><?php echo $option->text; ?></option>
90 <?php endforeach; ?>
91 </datalist>
92 <?php endif; ?>