If you have tried to install a plugin from market place in android studio, then you might be facing plugin error issue as some of the plugins are not updated .
The plugin directory structure is changed in new Android studio . You can try to install plugin manually by downloading plugin files from respective download locations and select install plugin from Disk from plugin options in Android Studio Preferences . Alternatively You can also go to plugins directory and create plugin folder and copy the jar file to plugin/lib directory.
For example if you encounter following error with ADB wifi plugin then download it from here and install it manually.
Plugin “Android WiFi ADB” is incompatible (supported only in IntelliJ IDEA).
Plugin “ADB WiFi Connect” is incompatible (supported only in IntelliJ IDEA).