loopbackjs - Loopback Custom Validation Throws Error -

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while using validatable.validate() custom function throwing internal loopback error.

var duplicateconnection = function(err, done, er) { connection.find({where: {userid: this.userid, nucleusid: this.nucleusid}},   function(bug, connection) {    if (!_.isempty(connection)) {err();}  }); }; connection.validate("userid", duplicateconnection);

error:

if (kind !== false) inst.errors.add(attr, message, code);                                 ^ typeerror: undefined not function  @ \node_modules\loopback-datasource-juggler\lib\validations.js:550:37


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