Fatal error installing 2.0.2

Old version works fine. I deleted it to install 2.0 from scratch. Am getting errors below. Any suggestions appreciated.

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 20480 bytes) in /wordpress/core/4.9.4/wp-includes/class-wp-hook.php on line 75

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 147456 bytes) in /wordpress/core/4.9.4/wp-includes/class-wp-hook.php on line 77

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 28672 bytes) in /wordpress/drop-ins/object-cache.php on line 351