Json expert needed

Json expert needed.I am getting below error for the json file.


ERROR:

Invalid setting value. Values can only contain alphanumeric characters, spaces and any of the following: _.:/=+@-, curly brackets and backslash


JSON:

{
"TableCount": "1",
"Tables": [
{
"TableName": "employee",
"TablePath": "hr/employee/",
"TableOwner": "hr",
"TableColumns": [
{
"ColumnName": "Id",
"ColumnType": "INT8",
"ColumnNullable": "false",
"ColumnIsPk": "true"
},
{
"ColumnName": "LastName",
"ColumnType": "STRING",
"ColumnLength": "20"
},
{
"ColumnName": "FirstName",
"ColumnType": "STRING",
"ColumnLength": "30"
},
{
"ColumnName": "HireDate",
"ColumnType": "DATETIME"
},
{
"ColumnName": "OfficeLocation",
"ColumnType": "STRING",
"ColumnLength": "20"
}
],
"TableColumnsTotal": "5"
}
]
}