Sitecore Experience Commerce - Cannot find certificate during install

When running the install script for Sitecore Experience Commerce 9.0, the following error message may appear:

Resolve-Path : Cannot find path 'D:\Projects\MyProject\Install\CommerceDeploy\storefront.engine.cer' because it does
not exist.
At D:\Projects\MyProject\Install\CommerceDeploy\SIF.Sitecore.Commerce.1.0.1748\Deploy-Sitecore-Commerce.ps1:44 char:33
+ ... EngineCertificatePath = Resolve-Path -Path "..\storefront.engine.cer"
+                             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (D:\Projects\Foo...ront.engine.cer:String) [Resolve-Path], ItemNotFoundE
   xception
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.ResolvePathCommand

 This is because a parameter was missed when looking over the install PowerShell script. Ensure that CommerceEngineCertificatePath points to the correct .cer file (exported at an earlier step in the installation guide for Experience Commerce).