diff --git a/lib/components/ApiInfo/api-info.ts b/lib/components/ApiInfo/api-info.ts
index 2ea4f63423..2138a64add 100644
--- a/lib/components/ApiInfo/api-info.ts
+++ b/lib/components/ApiInfo/api-info.ts
@@ -24,7 +24,7 @@ export class ApiInfo extends BaseComponent implements OnInit {
   init() {
     this.info = this.componentSchema.info;
     this.specUrl = this.optionsService.options.specUrl;
-    if (!isNaN(parseInt(this.info.version.substring(0, 1)))) {
+    if (!isNaN(parseInt(this.info.version.toString().substring(0, 1)))) {
       this.info.version = 'v' + this.info.version;
     }
   }
diff --git a/lib/utils/spec-manager.ts b/lib/utils/spec-manager.ts
index 951a18c098..379f624a41 100644
--- a/lib/utils/spec-manager.ts
+++ b/lib/utils/spec-manager.ts
@@ -83,7 +83,7 @@ export class SpecManager {
   preprocess() {
     let mdRender = new MdRenderer();
     if (!this._schema.info) {
-      throw 'Required field "info" is not specified at the spec top level';
+      throw Error('Specification Error: Required field "info" is not specified at the top level of the specification');
     }
     if (!this._schema.info.description) this._schema.info.description = '';
     if (this._schema.securityDefinitions) {