Unable to import test case due to an error although all the fields I have configured seems correct in the CSV file. Also I have saved CSV file with UTF-8 encoding.

Still I am receiving below error
{ "errors": [
{ "elementNumber": 0, "errors": { "customfield_13958": "Field 'customfield_13958' cannot be set. It is not on the appropriate screen, or unknown." } },
{ "elementNumber": 1, "errors": { "customfield_13958": "Field 'customfield_13958' cannot be set. It is not on the appropriate screen, or unknown." } } ], "issues": [], "warnings": []
}
Can someone please help me debug this issue.