diff --git a/src/app/instances/ns-primitive/NSPrimitiveComponent.html b/src/app/instances/ns-primitive/NSPrimitiveComponent.html
index 34b8a0e..f5344ff 100644
--- a/src/app/instances/ns-primitive/NSPrimitiveComponent.html
+++ b/src/app/instances/ns-primitive/NSPrimitiveComponent.html
@@ -23,33 +23,33 @@
 </div>
 <form [formGroup]="primitiveForm" (ngSubmit)="execPrimitive()">
     <div class="modal-body">
-        <div class="form-group row">
+        <div class="form-group row mb-3">
             <label class="col-sm-4 col-form-label">{{'PRIMITIVETYPE' | translate}}*</label>
             <div class="col-sm-8">
                 <ng-select (change)="primitiveTypeChange($event)" [clearable]="false" placeholder="{{'SELECT' | translate}}" [items]="primitiveTypeList" bindLabel="title" bindValue="value" [(ngModel)]="primitiveType" id="primitiveType" [ngModelOptions]="{standalone: true}"
                     [ngClass]="{ 'is-invalid': submitted && !primitiveType }"></ng-select>
             </div>
         </div>
-        <div class="form-group row" *ngIf="primitiveType === 'VNF_Primitive' || primitiveType === 'VDU_Primitive' || primitiveType === 'KDU_Primitive'">
+        <div class="form-group row mb-3" *ngIf="primitiveType === 'VNF_Primitive' || primitiveType === 'VDU_Primitive' || primitiveType === 'KDU_Primitive'">
             <label class="col-sm-4 col-form-label">VNF Profile ID *</label>
             <div class="col-sm-3">
                 <ng-select (change)="indexChange($event, primitiveType)" [clearable]="false" placeholder="{{'SELECT' | translate}}" [items]="memberTypes" bindLabel="id" bindValue="id" formControlName="member_vnf_index" id="member_vnf_index"
                     [ngClass]="{ 'is-invalid': submitted && f.member_vnf_index.errors }"></ng-select>
             </div>
         </div>
-        <div class="form-group row" *ngIf="primitiveType === 'VDU_Primitive'">
+        <div class="form-group row mb-3" *ngIf="primitiveType === 'VDU_Primitive'">
             <label class="col-sm-4 col-form-label">{{'SELECT' | translate}} VDU *</label>
             <div class="col-sm-8">
                 <ng-select (change)="getPrimitiveList($event, 'vdu')" [clearable]="false" placeholder="{{'SELECT' | translate}}" [items]="vduList" bindLabel="name" bindValue="id" formControlName="vdu_id" id="vdu_id" [ngClass]="{ 'is-invalid': submitted && f.vdu_id.errors }"></ng-select>
             </div>
         </div>
-        <div class="form-group row" *ngIf="primitiveType === 'KDU_Primitive'">
+        <div class="form-group row mb-3" *ngIf="primitiveType === 'KDU_Primitive'">
             <label class="col-sm-4 col-form-label">{{'SELECT' | translate}} KDU *</label>
             <div class="col-sm-8">
                 <ng-select (change)="getPrimitiveList($event, 'kdu')" [clearable]="false" placeholder="{{'SELECT' | translate}}" [items]="kduList" bindLabel="name" bindValue="name" formControlName="kdu_name" id="kdu_name" [ngClass]="{ 'is-invalid': submitted && f.kdu_name.errors }"></ng-select>
             </div>
         </div>
-        <div class="form-group row" *ngIf="primitiveType">
+        <div class="form-group row mb-3" *ngIf="primitiveType">
             <label class="col-sm-4 col-form-label">
                 {{'PAGE.NSPRIMITIVE.PRIMITIVE' | translate}}*</label>
             <div class="col-sm-8">
@@ -65,7 +65,7 @@
                 </div>
             </div>
             <div formArrayName="primitive_params" *ngFor="let params of getControls(); let i = index;">
-                <div class="form-group row" [formGroupName]="i">
+                <div class="form-group row mb-3" [formGroupName]="i">
                     <label class="col-sm-2 col-form-label">{{'NAME' | translate}}:</label>
                     <div class="col-sm-3">
                         <ng-select placeholder="{{'SELECT' | translate}}" [clearable]="false" [items]="primitiveParameter" bindLabel="name" bindValue="name" formControlName="primitive_params_name" id="parameter{{i}}" [ngClass]="{ 'is-invalid': submitted && params.controls.primitive_params_name.errors }">
diff --git a/src/app/instances/ns-primitive/NSPrimitiveComponent.ts b/src/app/instances/ns-primitive/NSPrimitiveComponent.ts
index 8f39a20..cf60b57 100644
--- a/src/app/instances/ns-primitive/NSPrimitiveComponent.ts
+++ b/src/app/instances/ns-primitive/NSPrimitiveComponent.ts
@@ -18,7 +18,6 @@
 /**
  * @file NS Instance Primitive Component
  */
-import { isNullOrUndefined } from 'util';
 import { Component, Injector, Input, OnInit } from '@angular/core';
 import { AbstractControl, FormArray, FormBuilder, FormGroup, Validators } from '@angular/forms';
 import { NgbActiveModal } from '@ng-bootstrap/ng-bootstrap';
@@ -30,7 +29,7 @@
 import { KDUPRIMITIVELEVEL, NSData, VDUPRIMITIVELEVEL, VNFPROFILE } from 'NSDModel';
 import { NSPrimitiveParams } from 'NSInstanceModel';
 import { RestService } from 'RestService';
-import { SharedService } from 'SharedService';
+import { SharedService, isNullOrUndefined } from 'SharedService';
 import { CONFIGPRIMITIVE, DF, VDUCONFIG, VDUPROFILE, VNFCONFIG, VNFD } from 'VNFDModel';
 import { VNFInstanceDetails } from 'VNFInstanceModel';