single sign on - Invalid CSRF Token 'null' was found on the request parameter '_csrf' or header 'X-CSRF-TOKEN' Spring SAML -

we implementing sso using spring saml, after getting authenticated when user gets redirected application getting following issue

invalid csrf token 'null' found on request parameter '_csrf' or header 'x-csrf-token' 

following code. login.html

<form class="form" role="form" ng-submit="login($event)">             <div class="form-group">                 <label for="username">login</label>                 <input type="text" class="form-control" id="username" placeholder="your login" ng-model="username">             </div>             <div class="form-group">                 <label for="password">password</label>                 <input type="password" class="form-control" id="password" placeholder="your password"                        ng-model="password">             </div>             <div class="form-group">                 <label for="rememberme">                     <input type="checkbox" id="rememberme" ng-model="rememberme" checked>                     <span>automatic login</span>                 </label>             </div>             <input type="hidden" name="${_csrf.parametername}" value="${_csrf.token}"/>             <button type="submit" class="btn btn-primary">authenticate</button>         </form> 

index.html

 <meta http-equiv="x-ua-compatible" content="ie=edge">     <meta name="_csrf_parameter" content="_csrf" />     <meta name="_csrf_header" content="x-csrf-token" />     <meta name="_csrf" content="${_csrf.token}" /> 

secutityconfig.java

@bean public csrftokenrepository csrftokenrepository()  {      httpsessioncsrftokenrepository repository = new httpsessioncsrftokenrepository();      repository.setsessionattributename("_csrf");     return repository;  }  @override protected void configure(httpsecurity http) throws exception {     http         .csrf()         .csrftokenrepository(csrftokenrepository())     .and()         .addfilterafter(new csrfcookiegeneratorfilter(), csrffilter.class)         .exceptionhandling()         .authenticationentrypoint(authenticationentrypoint) 

please guide mt wrong doing.

thanks & regards mahesh