unable to edit object

[fiammybe]

When I want to edit an object on a 1.4.4 install running on PHP 7.4 after having created that object, I get the following error:

This page cannot be displayed due to an internal error.

You can provide the following information to the administrators of this site to help them solve the problem:

Error: Function name must be a string

File: C:\xampp74\htdocs\144\libraries\icms\ipf\form\elements\Select.php
Line: 43
Backtrace:
/libraries/icms/ipf/form/Base.php (160)
/libraries/icms/ipf/form/Base.php (53)
/libraries/icms/ipf/Object.php (392)
/modules/imbuilding/admin/object.php (37)
/modules/imbuilding/admin/object.php (87)
Developer Dashboard

None | All | Errors (12) Queries (26) Blocks (6) Extra (2) Timers (4) Deprecated (1) Filters (0)
Errors (12)
Warning: A non-numeric value encountered in file TRUSTPATH/modules/protector/include/postcheck_functions.php line 87
Warning: A non-numeric value encountered in file TRUSTPATH/modules/protector/include/postcheck_functions.php line 89
Unknown: Unparenthesized a ? b : c ? d : e is deprecated. Use either (a ? b : c) ? d : e or a ? b : (c ? d : e) in file /include/cp_functions.php line 653
Unknown: Unparenthesized a ? b : c ? d : e is deprecated. Use either (a ? b : c) ? d : e or a ? b : (c ? d : e) in file /libraries/icms/view/block/Handler.php line 137
Unknown: Unparenthesized a ? b : c ? d : e is deprecated. Use either (a ? b : c) ? d : e or a ? b : (c ? d : e) in file /libraries/icms/view/block/Handler.php line 557
Warning: count(): Parameter must be an array or an object that implements Countable in file /libraries/icms/view/block/Handler.php line 75
Unknown: Function create_function() is deprecated in file /libraries/icms/view/block/Handler.php line 222
Unknown: Elements from icms.css need to be moved to your theme in file /libraries/icms/core/Debug.php line 61
Warning: count(): Parameter must be an array or an object that implements Countable in file /libraries/icms/module/Object.php line 330
Notice: Array to string conversion in file /libraries/icms/ipf/form/elements/Select.php line 43
Notice: Undefined property: mod_imbuilding_Object::$Array in file /libraries/icms/ipf/form/elements/Select.php line 43
Notice: Trying to access array offset on value of type null in file /libraries/icms/ipf/form/elements/Select.php line 43