PSInvalidCastException: Cannot convert the "dummystring" value of type "System.String" to type "System.Security.SecureString"

[MisinformedDNA]

I get this error when I try to use your script:

Context Azure API Validation
  [-] Error occurred in Context block 0ms
    PSInvalidCastException: Cannot convert the "dummystring" value of type "System.String" to type "System.Security.SecureString".
    ParameterBindingException: Cannot bind parameter 'sqlServerAdminPassword'. Cannot convert the "dummystring" value of type "System.String" to type "System.Security.SecureString".
    at <ScriptBlock>, C:\repos\ecommerce2\deploy\Atlas.Ecommerce.Deployment\azuredeploy.tests.ps1: line 188
    at DescribeImpl, C:\Users\50587\Documents\WindowsPowerShell\Modules\Pester\4.7.3\Functions\Describe.ps1: line 199

Here are some snippets of my ARM files:

azuredeploy.parameters.json

{
  "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentParameters.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "sqlServerAdminPassword": { "value": "This is a password!" }
  }
}

azuredeploy.json

{
  "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "sqlServerAdminPassword": {
      "type": "securestring"
    }
  }
}

[vegar]

I solved this by modifying the script a little:

Around line 163:

"securestring" {
  [Security.SecureString]$secureValue = (ConvertTo-SecureString "P@ssW0rD!" -asplaintext -force)
  $TemplateParameters.Add($Parameter, $secureValue)
}