Powershell script not able to trigger jenkins build:

$API_User = "admin"
$API_Pass = "password"
$API_URL = "localhost"
$API_Port = "8080"
$API_Job = "test01"

$Params = @{uri = "http://${API_URL}:${API_Port}/crumbIssuer/api/json";
            Method = 'Get';
            Headers = @{Authorization = 'Basic ' + [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes("$(${API_User}):$(${API_Pass})"));}}
$API_Crumb = Invoke-RestMethod @Params

$Params = @{uri = "http://${API_URL}:${API_Port}/job/${API_Job}/build";
            Method = 'Post';
            Headers = @{'Jenkins-Crumb' = "$API_Crumb.Crumb";}}
Invoke-RestMethod @Params

error:

Invoke-RestMethod : HTTP ERROR 403
Problem accessing /job/test01/build. Reason:
    No valid crumb was included in the request
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