I am facing some strange issues in Magento 2.1.3, i have configured third party theme and working fine, once i run
setup:static-content:deploy, am getting fatal errors like i added below from core code. if we solve one error then it is throwing other errors.
I found same issues here MAGETWO-51440, even my code had the changes.
Fatal error: Uncaught Error: Call to undefined method ReflectionParameter::isArray() in \vendor\magento\framework\Code\Generator\EntityAbstract.php:324
Can any one help me on this strange issue.