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You have a unit named with a special char
"AAR_unit": "R Bandits "Les Sans Pit Yeah "
64 bit ALiVEClient.DLL should be in the release.
64bil ALiVEPLugIn.DLL is available from War Room when you setup your server.
Its in dev and available as 1.2.9 from github for testing.
Only use the data module
Are you using sys_data_auto.pbo for auto start of data? If so, then highly likely.
Workaround is to ensure the data module is placed in your mission.
Ok, confirmed there is a bug. Will try to get a hotfix out over the next few days.
Need the RPT
Can you put on Data debug and send the RPT?