Preferences file is not valid JSON

[FrankL217]

So i am getting the "Preferences file is not valid JSON" error message and ive searched this and tried all the solutions ive seen posted. Unfortunately none worked for me. Here is the JSON file.

{
"brackets-eslint.gutterMarks": true,
"brackets-eslint.useLocalESLint": false,
"fonts.fontSize": "12px",
"fonts.fontFamily": "'SourceCodePro-Medium', ＭＳ ゴシック, 'MS Gothic', monospace"
}

"externalApplications": {
"jpg": "default",
"jpeg": "default",
"png": "default",
"svg": "C://Program Files (x86)//Microsoft//Edge//Application//msedge.exe"
}

currently i tried using forward slashes as someone had mentioned that that could be the issue. it didnt work for me though.
any help greatly appreciated.