Error loading WDL and importing workflow

I'm attempting to launch the GiraffeDeepVariantLite workflow, which has a Launch with Terra link. The link takes me to an "Import Workflow" page in Terra, which immediately hits a "Error loading WDL" error. The details just say:

[object Object]

If I attempt to fill out the form by choosing a "Destination Workspace" and clicking "IMPORT", I get a "Error importing workflow" error, with the following details:

Bad Request
Full error:
{
  "causes": [],
  "exceptionClass": "cromwell.client.ApiException",
  "message": "Bad Request",
  "source": "rawls",
  "stackTrace": [
    {
      "className": "cromwell.client.ApiClient",
      "fileName": "ApiClient.java",
      "lineNumber": 1030,
      "methodName": "handleResponse"
    },
    {
      "className": "cromwell.client.ApiClient",
      "fileName": "ApiClient.java",
      "lineNumber": 946,
      "methodName": "execute"
    },
    {
      "className": "cromwell.client.api.WomtoolApi",
      "fileName": "WomtoolApi.java",
      "lineNumber": 179,
      "methodName": "describeWithHttpInfo"
    },
    {
      "className": "cromwell.client.api.WomtoolApi",
      "fileName": "WomtoolApi.java",
      "lineNumber": 155,
      "methodName": "describe"
    },
    {
      "className": "org.broadinstitute.dsde.rawls.dataaccess.CromwellSwaggerClient",
      "fileName": "CromwellSwaggerClient.scala",
      "lineNumber": 27,
      "methodName": "$anonfun$describe$2"
    },
    {
      "className": "scala.util.Try$",
      "fileName": "Try.scala",
      "lineNumber": 217,
      "methodName": "apply"
    },
    {
      "className": "org.broadinstitute.dsde.rawls.dataaccess.CromwellSwaggerClient",
      "fileName": "CromwellSwaggerClient.scala",
      "lineNumber": 25,
      "methodName": "$anonfun$describe$1"
    },
    {
      "className": "org.broadinstitute.dsde.rawls.dataaccess.CromwellSwaggerClient",
      "fileName": "CromwellSwaggerClient.scala",
      "lineNumber": 24,
      "methodName": "describe"
    },
    {
      "className": "org.broadinstitute.dsde.rawls.jobexec.wdlparsing.CachingWDLParser",
      "fileName": "CachingWDLParser.scala",
      "lineNumber": 78,
      "methodName": "inContextParse"
    },
    {
      "className": "org.broadinstitute.dsde.rawls.jobexec.wdlparsing.CachingWDLParser",
      "fileName": "CachingWDLParser.scala",
      "lineNumber": 54,
      "methodName": "parseAndCache"
    },
    {
      "className": "org.broadinstitute.dsde.rawls.jobexec.wdlparsing.CachingWDLParser",
      "fileName": "CachingWDLParser.scala",
      "lineNumber": 47,
      "methodName": "parse"
    },
    {
      "className": "org.broadinstitute.dsde.rawls.jobexec.MethodConfigResolver",
      "fileName": "MethodConfigResolver.scala",
      "lineNumber": 16,
      "methodName": "parseWDL"
    },
    {
      "className": "org.broadinstitute.dsde.rawls.jobexec.MethodConfigResolver",
      "fileName": "MethodConfigResolver.scala",
      "lineNumber": 70,
      "methodName": "getMethodInputsOutputs"
    },
    {
      "className": "org.broadinstitute.dsde.rawls.workspace.WorkspaceService",
      "fileName": "WorkspaceService.scala",
      "lineNumber": 2080,
      "methodName": "$anonfun$getMethodInputsOutputs$2"
    },
    {
      "className": "org.broadinstitute.dsde.rawls.util.MethodWiths",
      "fileName": "WithSupport.scala",
      "lineNumber": 53,
      "methodName": "$anonfun$withMethod$1"
    },
    {
      "className": "slick.basic.BasicBackend$DatabaseDef",
      "fileName": "BasicBackend.scala",
      "lineNumber": 172,
      "methodName": "$anonfun$runInContextInline$1"
    },
    {
      "className": "scala.concurrent.impl.Promise$Transformation",
      "fileName": "Promise.scala",
      "lineNumber": 470,
      "methodName": "run"
    },
    {
      "className": "java.util.concurrent.ForkJoinTask$RunnableExecuteAction",
      "fileName": null,
      "lineNumber": -1,
      "methodName": "exec"
    },
    {
      "className": "java.util.concurrent.ForkJoinTask",
      "fileName": null,
      "lineNumber": -1,
      "methodName": "doExec"
    },
    {
      "className": "java.util.concurrent.ForkJoinPool$WorkQueue",
      "fileName": null,
      "lineNumber": -1,
      "methodName": "topLevelExec"
    },
    {
      "className": "java.util.concurrent.ForkJoinPool",
      "fileName": null,
      "lineNumber": -1,
      "methodName": "scan"
    },
    {
      "className": "java.util.concurrent.ForkJoinPool",
      "fileName": null,
      "lineNumber": -1,
      "methodName": "runWorker"
    },
    {
      "className": "java.util.concurrent.ForkJoinWorkerThread",
      "fileName": null,
      "lineNumber": -1,
      "methodName": "run"
    }
  ],
  "statusCode": 400
}

Is the implication here that the GiraffeDeepVariantLite WDL file is invalid?