Cannot download task output files

[gingi]

Describe the bug
The downloading task output files button does not work.

To Reproduce
Steps to reproduce the behavior:

1. Navigate to a completed job task
2. Select a file, such as "stdout.txt"
3. Press on the 'Download' icon button
4. Select target location
5. Press on the 'Download' button
6. See the error

Expected behavior
The target file to be downloaded

Screenshots
No file is downloaded

Logs(Click profile > View Logs > app.log, client.log)

DownloadButtonComponent.html:2 ERROR TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received type object
    at validateString (internal/validators.js:112)
    at Object.dirname (path.js:1128)
    at FileLoader.download (file-loader.ts:147)
    at FileViewerHeaderComponent._saveFile (file-viewer-header.component.ts:109)
    at FileViewerHeaderComponent.downloadFile (file-viewer-header.component.ts:77)
    at ButtonComponent._execute (button.component.ts:127)
    at ButtonComponent.handleAction (button.component.ts:105)
    at ButtonComponent.handleClick (clickable.component.ts:100)
    at Object.eval [as handleEvent] (DownloadButtonComponent.html:2)
    at handleEvent (core.js:31247)
View_DownloadButtonComponent_0 @ DownloadButtonComponent.ngfactory.js? [sm]:1
proxyClass @ compiler.js:22443
DebugContext_.logError @ core.js:32296
ErrorHandler.handleError @ core.js:4175
handleError @ error-handler.ts:15
dispatchEvent @ core.js:21512
eval @ core.js:30451
eval @ platform-browser.js:600
ZoneDelegate.invokeTask @ zone.js:421
onInvokeTask @ core.js:28120
ZoneDelegate.invokeTask @ zone.js:420
Zone.runTask @ zone.js:188
ZoneTask.invokeTask @ zone.js:503
invokeTask @ zone.js:1671
globalZoneAwareCallback @ zone.js:1697
DownloadButtonComponent.html:2 ERROR CONTEXT DebugContext_ {view: {…}, nodeIndex: 0, nodeDef: {…}, elDef: {…}, elView: {…}}
View_DownloadButtonComponent_0 @ DownloadButtonComponent.ngfactory.js? [sm]:1
proxyClass @ compiler.js:22443
DebugContext_.logError @ core.js:32296
ErrorHandler.handleError @ core.js:4180
handleError @ error-handler.ts:15
dispatchEvent @ core.js:21512
eval @ core.js:30451
eval @ platform-browser.js:600
ZoneDelegate.invokeTask @ zone.js:421
onInvokeTask @ core.js:28120
ZoneDelegate.invokeTask @ zone.js:420
Zone.runTask @ zone.js:188
ZoneTask.invokeTask @ zone.js:503
invokeTask @ zone.js:1671
globalZoneAwareCallback @ zone.js:1697
renderer-logger.ts:8 [BL] Uncaught exception: The "path" argument must be of type string. Received type object
log @ renderer-logger.ts:7
log @ renderer-logger.ts:37
error @ renderer-logger.ts:23
handleCoreError @ error-handler.ts:25
handleError @ error-handler.ts:16
dispatchEvent @ core.js:21512
eval @ core.js:30451
eval @ platform-browser.js:600
ZoneDelegate.invokeTask @ zone.js:421
onInvokeTask @ core.js:28120
ZoneDelegate.invokeTask @ zone.js:420
Zone.runTask @ zone.js:188
ZoneTask.invokeTask @ zone.js:503
invokeTask @ zone.js:1671
globalZoneAwareCallback @ zone.js:1697

Version (please complete the following information):

• OS: Windows + MacOS
• Version 2.8.0