Error: file_put_contents(/home/sdp/web/themes-production.sdp-platform.com/storage/framework/views/bd392427fda80954729f2981f50762bb.php): Failed to open stream: Permission denied

Neurotransmitters associated with mood

What major neurotransmitters are associated with mood? How are they involved in abnormal behavior?
What role do emotions play in psychopathology?