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# ask-community-for-troubleshooting
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Ben la Grange

08/31/2021, 1:02 PM
Next hurdle - I’m testing with CDC of one table (Psql->BQ), initial sync worked, but incremental syncs are not picking up any changes.
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the first error I’m seeing in the sync logs:
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2021-08-31 12:42:43 INFO () JsonSchemaValidator(test):76 - JSON schema validation failed. 
errors: $: unknown found, object expected
2021-08-31 12:42:43 ERROR () DefaultAirbyteStreamFactory(lambda$create$1):83 - Validation failed: null
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[DEPRECATED] Marcos Marx

08/31/2021, 1:17 PM
It's possible to share the complete logs @Ben la Grange?
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Ben la Grange

08/31/2021, 1:18 PM
Hi @[DEPRECATED] Marcos Marx any tips?
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[DEPRECATED] Marcos Marx

09/01/2021, 7:57 PM
@Ben la Grange are there any new data in source? (just checking this) besides that the error is not something critical.
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Ben la Grange

09/02/2021, 5:14 AM
Yes, there are many new and updated rows in the source every day.
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[DEPRECATED] Marcos Marx

09/02/2021, 7:33 PM
Ben the first sync pulled data to the destination?
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2021-08-31 13:10:13 INFO () DefaultAirbyteStreamFactory(lambda$create$0):73 - 2021-08-31 13:10:13 [32mINFO[m i.d.c.p.PostgresStreamingChangeEventSource(searchWalPosition):287 - {} - WAL resume position 'null' discovered
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Ben la Grange

09/03/2021, 6:30 AM
The first sync pulled data (not in this log file), the rest all say WAL resume position ‘null’ discovered
Hi Marcos, continued and resolved here for now thank you: https://airbytehq.slack.com/archives/C01MFR03D5W/p1630572024268600
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