How to resolve the 500 error when importing bulk custom fields?

[Saarvaani Vadlamani]

I am trying to run the curl command to import bulk custom fields from my command line.

The command looks like below:

curl -u <username>:<password> "https://<JIRA url>/rest/scriptrunner/latest/canned/com.onresolve.scriptrunner.canned.jira.admin.BulkImportCustomFieldValues" -H "X-Atlassian-token: no-check" -H "Content-Type: application/x-www-form-urlencoded; charset=UTF-8" -H "Accept: application/json" --data "@add-opt.json"

contents of add-opt.json:

scriptParams={
"FIELD_FCS":"Default Configuration Scheme for samplelist2",
"FIELD_IMPORT_VALUES":"option1",
"canned-script":"com.onresolve.scriptrunner.canned.jira.admin.BulkImportCustomFieldValues"
}

I am getting the following error:

{"message":"For input string: \"Default Configuration Scheme for samplelist2\"",
"status-code":500,"stack-trace":"java.lang.NumberFormatException: For input stri
ng: \"Default Configuration Scheme for samplelist2\"\r\n\tat com.onresolve.scrip
trunner.canned.jira.admin.BulkImportCustomFieldValues.getSchemeFromParams(BulkIm
portCustomFieldValues.groovy:83)\r\n\tat com.onresolve.scriptrunner.canned.jira.
admin.BulkImportCustomFieldValues.doValidate(BulkImportCustomFieldValues.groovy:
68)\r\n"}

Please help in figuring out where I am going wrong.

Thank you