Fatal error: Uncaught ErrorException

MacOS Catalina 10.15.2
Wappler 2.4.4

Fatal error: Uncaught ErrorException: Cannot modify header information - headers already sent by (output started at /var/www/html/dmxConnectLib/lib/formatters/._collections.php:1) in /var/www/html/dmxConnectLib/dmxConnect.php:82 Stack trace: #0 [internal function]: exception_error_handler(2, ‘Cannot modify h…’, ‘/var/www/html/d…’, 82, Array) #1 /var/www/html/dmxConnectLib/dmxConnect.php(82): header(‘HTTP/1.1 500 In…’) #2 [internal function]: exception_handler(Object(ErrorException)) #3 {main} thrown in /var/www/html/dmxConnectLib/dmxConnect.php on line 82

Fatal error: Uncaught ErrorException: Cannot modify header information - headers already sent by (output started at /var/www/html/dmxConnectLib/lib/formatters/._collections.php:1) in /var/www/html/dmxConnectLib/dmxConnect.php:43 Stack trace: #0 [internal function]: exception_error_handler(2, ‘Cannot modify h…’, ‘/var/www/html/d…’, 43, Array) #1 /var/www/html/dmxConnectLib/dmxConnect.php(43): header(‘HTTP/1.1 500 In…’) #2 [internal function]: fatal_handler() #3 {main} thrown in /var/www/html/dmxConnectLib/dmxConnect.php on line 43
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Please check the following topic where the same problem is described and solved: