Upgraded to Mac Catalina, now #include errors detected in VS Code

[JeffFink]

VS code was working fine, then I upgraded to Mac Catalina, and I now have this error

#include errors detected. Please update your includePath. Squiggles are disabled for this translation unit

Also this error

cannot open source file "iostream"
cannot open source file "iomanip" etc...

My c_cpp_properties.json is

{
"configurations": [
{
"name": "Mac",
"includePath": [
"${workspaceFolder}/**"
],
"defines": [],
"macFrameworkPath": [
"/System/Library/Frameworks",
"/Library/Frameworks"
],
"intelliSenseMode": "clang-x64"
}
],
"version": 4
}

and my settings.json is

{
"files.associations": {
"iostream": "cpp",
"iosfwd": "cpp"
}
}

I need this to work. Please help!