Stacktrace is a bit unhelpful and I only get this in production, so limited debug options
Error: Invalid Access Token
at [proj_root]/node_modules/loopback/common/models/access-token.js:110:23
at [proj_root]/node_modules/loopback/common/models/access-token.js:155:11
at [proj_root]/node_modules/loopback-datasource-juggler/lib/dao.js:2514:17
at doNotify ([proj_root]/node_modules/loopback-datasource-juggler/lib/observer.js:98:49)
at doNotify ([proj_root]/node_modules/loopback-datasource-juggler/lib/observer.js:98:49)
at doNotify ([proj_root]/node_modules/loopback-datasource-juggler/lib/observer.js:98:49)
at doNotify ([proj_root]/node_modules/loopback-datasource-juggler/lib/observer.js:98:49)
at Function.ObserverMixin._notifyBaseObservers ([proj_root]/node_modules/loopback-datasource-juggler/lib/observer.js:121:5)
at Function.ObserverMixin.notifyObserversOf ([proj_root]/node_modules/loopback-datasource-juggler/lib/observer.js:96:8)
at Function.ObserverMixin._notifyBaseObservers ([proj_root]/node_modules/loopback-datasource-juggler/lib/observer.js:119:15)
at Function.ObserverMixin.notifyObserversOf ([proj_root]/node_modules/loopback-datasource-juggler/lib/observer.js:96:8)
at Function.ObserverMixin._notifyBaseObservers ([proj_root]/node_modules/loopback-datasource-juggler/lib/observer.js:119:15)
at Function.ObserverMixin.notifyObserversOf ([proj_root]/node_modules/loopback-datasource-juggler/lib/observer.js:96:8)
at Function.ObserverMixin._notifyBaseObservers ([proj_root]/node_modules/loopback-datasource-juggler/lib/observer.js:119:15)
at Function.ObserverMixin.notifyObserversOf ([proj_root]/node_modules/loopback-datasource-juggler/lib/observer.js:96:8)
at [proj_root]/node_modules/loopback-datasource-juggler/lib/dao.js:2513:21