Python script to update Jira : Error : It is not on the appropriate screen, or unknown

[Ganesh Sureddy]

Hi , Can you please help on below error - We get it when we run python script to insert some data into JIRA fields:

{"errorMessages":[],
"errors":{"Request Type[Dropdown]":"Field 'Request Type[Dropdown]' cannot be set. It is not on the appropriate screen, or unknown.","Application Name[Select List (multiple choices)]":"Field 'Application Name[Select List (multiple choices)]' cannot be set. It is not on the appropriate screen, or unknown."}}
'key'

Code Snippet used : 

"Request Type[Dropdown]": {
"name": "Create new MFT shared folder"
},
"Application Name[Select List (multiple choices)]": [
{
"name": "MFT"
}
]