Error: Error: [] operator not supported for strings

[officertatum]

Hi,

 

When I try to upgrade a free trial to paid product it gives me this error

Oops!

Something went wrong and we couldn't process your request.

Please go back to the previous page and try again.

Error: [] operator not supported for strings in /var/www/html/whmcs/includes/upgradefunctions.php:0
Stack trace:
#0 /var/www/html/whmcs/upgrade.php(0): SumUpPackageUpgradeOrder('69', 5, 'monthly', NULL, 'brick', true)
#1 {main}

[NDMA]

https://stackoverflow.com/questions/41000714/php7-1-fatal-error-operator-not-supported-for-strings I have the same error ; with this being an ongoing issue from Feb I'm not nearly as hopeful about resolution hmm.