Can’t activate the plugin

Getting following on activating the plugin. WP_DEBUG is enabled:

Fatal error: Uncaught UnexpectedValueException: The stream or file “/var/www/site.in/wp-admin/” could not be opened in append mode: failed to open stream: Is a directory in /var/www/site.in/wp-content/plugins/wpide/vendor/monolog/monolog/src/Monolog/Handler/StreamHandler.php:115 Stack trace: #0 /var/www/site.in/wp-content/plugins/wpide/vendor/monolog/monolog/src/Monolog/Handler/AbstractProcessingHandler.php(39): Monolog\Handler\StreamHandler->write() #1 /var/www/site.in/wp-content/plugins/wpide/vendor/monolog/monolog/src/Monolog/Logger.php(344): Monolog\Handler\AbstractProcessingHandler->handle() #2 /var/www/site.in/wp-content/plugins/wpide/vendor/monolog/monolog/src/Monolog/Logger.php(614): Monolog\Logger->addRecord() #3 /var/www/site.in/wp-content/plugins/wpide/vendor/monolog/monolog/src/Monolog/ErrorHandler.php(160): Monolog\Logger->log() #4 [internal function]: Monolog\ErrorHandler->handleError() #5 /var/www/site.in/wp-content/fatal-error-handler.php(216): in /var/www/site.in/wp-content/plugins/wpide/vendor/monolog/monolog/src/Monolog/Handler/StreamHandler.php on line 115

Fatal error: Uncaught UnexpectedValueException: The stream or file “/var/www/site.in/wp-admin/” could not be opened in append mode: failed to open stream: Is a directory in /var/www/site.in/wp-content/plugins/wpide/vendor/monolog/monolog/src/Monolog/Handler/StreamHandler.php:115 Stack trace: #0 /var/www/site.in/wp-content/plugins/wpide/vendor/monolog/monolog/src/Monolog/Handler/AbstractProcessingHandler.php(39): Monolog\Handler\StreamHandler->write() #1 /var/www/site.in/wp-content/plugins/wpide/vendor/monolog/monolog/src/Monolog/Logger.php(344): Monolog\Handler\AbstractProcessingHandler->handle() #2 /var/www/site.in/wp-content/plugins/wpide/vendor/monolog/monolog/src/Monolog/Logger.php(614): Monolog\Logger->addRecord() #3 /var/www/site.in/wp-content/plugins/wpide/vendor/monolog/monolog/src/Monolog/ErrorHandler.php(160): Monolog\Logger->log() #4 [internal function]: Monolog\ErrorHandler->handleError() #5 /var/www/site.in/wp-content/fatal-error-handler.php(216): in /var/www/site.in/wp-content/plugins/wpide/vendor/monolog/monolog/src/Monolog/Handler/StreamHandler.php on line 115