Drupal8安装：Fatal error: Call to a member function setRecipients()......

1. Stopped Apache.

2. Modified and saved PHP.ini file

[opcache]; Determines if Zend OPCache is enabledopcache.enable=1; Determines if Zend OPCache is enabled for the CLI version of PHPopcache.enable_cli=1; The OPcache shared memory storage size.opcache.memory_consumption=128; The amount of memory for interned strings in Mbytes.opcache.interned_strings_buffer=8; The maximum number of keys (scripts) in the OPcache hash table.; Only numbers between 200 and 100000 are allowed.opcache.max_accelerated_files=4000...; How often (in seconds) to check file timestamps for changes to the shared; memory storage allocation. ("1" means validate once per second, but only; once per request. "0" means always validate)opcache.revalidate_freq=60...; If enabled, a fast shutdown sequence is used for the accelerated codeopcache.fast_shutdown=1...

And, I added the zend_extension reference to the PHP.ini file [PHP] section -- important to add it in this section. I added it at the end of the "Paths and Directories" subsection of that PHP section:

;;;;;;;;;;;;;;;;;;;;;;;;;; Paths and Directories ;;;;;;;;;;;;;;;;;;;;;;;;;;...; Tyme added to resolve install issuezend_extension = "C:\xampp\php\ext\php_opcache.dll";;;;;;;;;;;;;;;;; File Uploads ;;;;;;;;;;;;;;;;;

3. Restarted Apache.