diff --git a/index.js b/index.js
index b2b73b6..b65ac07 100644
--- a/index.js
+++ b/index.js
@@ -59,13 +59,7 @@ module.exports = {
               reason: err
             });
           });
-      }, (err) => {
-        if (err) {
-          return cb(null, {
-            result: false,
-            reason: _.toString(err.reason)
-          });
-        }
+      }, () => {
 
         var conversionResult = false,
           convertedCollections = [],
diff --git a/lib/convert.js b/lib/convert.js
index 3a794e6..d0f7705 100644
--- a/lib/convert.js
+++ b/lib/convert.js
@@ -261,9 +261,7 @@ var sdk = require('postman-collection'),
 module.exports = {
   convert: function(json, options, callback) {
     try {
-      converter.convert(json, options, (err, result) => {
-        callback(null, result);
-      });
+      converter.convert(json, options, callback);
     }
     catch (e) {
       if (e instanceof OpenApiErr) {
diff --git a/lib/parse.js b/lib/parse.js
index 88eebeb..086bbc8 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -103,14 +103,14 @@ module.exports = {
   getOasObject: function (file) {
     let oasObj = file;
 
-    if (typeof file === 'string') {
+    if (typeof oasObj === 'string') {
       try {
-        oasObj = JSON.parse(file);
+        oasObj = JSON.parse(oasObj);
       }
       catch (jsonEx) {
         // Not direct JSON. Could be YAML
         try {
-          oasObj = yaml.safeLoad(file);
+          oasObj = yaml.safeLoad(oasObj);
         }
         catch (yamlEx) {
           // Not JSON or YAML