Administration console - launching javascript tasks doesn't work

Steps to reproduce:
upload javascript

• click on cache container -> Configuration -> Tasks -> Create new script
• fill in the mandatory parameter (e.g. Task name: simpleTask, Language: javascript, Execution mode: local, script body: console.debug("test"))
• click create script task button

run the script:

• click on cache container -> Tasks execution -> Launch new task
• fill in the mandatory parameter (e.g. Task: simpleTask, cache: localCache, originator node: master/server-one)
• click Launch task button

result:
console shows error:
Error Some unexpected problem happened when launching the task: DGISPN0118: Failed to invoke operation: ISPN026003: Script execution error

web browser console shows:
POST XHR http://admin:adminPass9!@localhost:9990/management [HTTP/1.1 401 Unauthorized 23ms]