Fatal error: Array and string offset access syntax with curly braces is no longer supported in C:\xampp\htdocs\wp-headless-cms\wp-content\plugins\wp-pro-quiz\lib\helper\WpProQuiz_Helper_Upgrade.php on line 69
To fix the error "Fatal error: Array and string offset access syntax with curly braces is no longer supported" in the file "WpProQuiz_Helper_Upgrade.php", you can do the following:
Open the file "WpProQuiz_Helper_Upgrade.php" in a text editor.
Go to line 69, where the error is occurring.
Look for any code that uses curly braces to access an array or string offset.
Replace the curly braces with square brackets, which is the new syntax for accessing array or string offsets in PHP.
Save the file and try running your code again to see if the error is resolved.
For example, if the code on line 69 looks like this:
if ($version{0} == '2') {
WpProQuiz_Plugin_BpAchievementsV2::install();
}
to
if ($version[0] == '2') {
WpProQuiz_Plugin_BpAchievementsV2::install();
}