REST API Send From Library JSON Format

Hi, I'm having issues with using the REST API. I'm trying the post/agreement and I'm using the JSON below, but for some reason I'm getting an error and I can't figure out why. Any advice would be much appreciated.

{
"fileInfos": [
{
"libraryDocumentId": "CBJCHBCAABAAwdTX40V4_gy3LbSTJF-dYsbhYjd6Iqj7",
}
],
"name": "Testing",
"participantSetsInfo": [
{
"memberInfos": [
{
"email": "my.email@mycompany.com"
}
],
"order": 1,
"role": "SIGNER"
}
],
"signatureType": "ESIGN",
"state": "IN_PROCESS"
}