error when import json from 3.6.x to 3.7..7

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Hi,
When I tried to import a mango configuration json file from
3.6.x to 3.7.7, I have encountered the below error:

Bad Request — com.fasterxml.jackson.core.JsonParseException: Invalid UTF-8 start byte 0xb7 at [Source: (PushbackInputStream); line: 1403, column: 21]

Here is the line in the json file, where column 21 is at the letter 'h':

         "unit":"kW·h",

here is the fuller text:

{
         "xid":"DP_A40-001_TOTAL-ACTIVE-ENE",
         "name":"A40-001_TOTAL-ACTIVE-ENE",
         "enabled":true,
         "loggingType":"ALL",
         "intervalLoggingPeriodType":"MINUTES",
         "intervalLoggingType":"INSTANT",
         "purgeType":"YEARS",
         "pointLocator":{
            "dataType":"NUMERIC",
            "objectType":"ANALOG_INPUT",
            "propertyIdentifier":"present-value",
            "objectInstanceNumber":10,
            "remoteDeviceInstanceNumber":70105,
            "settable":false,
            "useCovSubscription":true,
            "writePriority":16
         },
         "eventDetectors":[
         ],
         "plotType":"BAR",
         "rollup":"DELTA",
         "unit":"kW·h",
         "simplifyType":"NONE",
         "chartColour":"",
         "chartRenderer":{
            "type":"IMAGE",
            "timePeriodType":"DAYS",
            "numberOfPeriods":1
         },
         "dataSourceXid":"DS_7ac14293-15aa-43ef-bdcc-12d5af712833",
         "defaultCacheSize":288,
         "deviceName":"SWAN574_70105",
         "discardExtremeValues":false,
         "discardHighLimit":1.7976931348623157E308,
         "discardLowLimit":-1.7976931348623157E308,
         "intervalLoggingPeriod":5,
         "intervalLoggingSampleWindowSize":0,
         "overrideIntervalLoggingSamples":false,
         "preventSetExtremeValues":false,
         "purgeOverride":false,
         "purgePeriod":1,
         "readPermission":"",
         "setExtremeHighLimit":1.7976931348623157E308,
         "setExtremeLowLimit":-1.7976931348623157E308,
         "setPermission":"",
         "tags":{
            "MeterData":"3 Phase Total Energy",
            "MeterName":"MainIncomingSupply"
         },
         "textRenderer":{
            "type":"ANALOG",
            "useUnitAsSuffix":true,
            "format":"0"
         },
         "tolerance":0.0
      },

will this have something to do with the unit not being accepted in 3.7.7?
How can I fix this?
Do I replace it with something blank so I can at least get through the import process?

Any help is appreciated!