CouchbaseException: \"status\":\"SUBDOC_FAILURE\", \"subdocStatus\":\"PATH_INVALID\",

Dear Team,

one of my app team is getting below error , could you please check why it coming like that. the same dev code is woking fine on their local when they are tested. but when we moved same code to QA it is not working and sending below error.

[{“instant”:{“epochSecond”:1668601536,“nanoOfSecond”:868114000},
“thread”:“org.springframework.kafka.KafkaListenerEndpointContainer#0-0-C-1”,
“level”:“ERROR”,
“loggerName”:“com.rt.dep.common_modules.repository.MessageEventDetailsRepository”,
“message”:"*******************Exception occuredcom.couchbase.client.core.error.CouchbaseException:
Unexpected SubDocument response code {
"completed":true,
"coreId":"0x2b038d8c00000001",
"idempotent":false,
"index":0,
"lastChannelId":"2B038D8C00000001/000000008869E088",
"lastDispatchedFrom":"240b:c0e0:204:5400:b424:2:0:fb4%0:58744",
"lastDispatchedTo":"240b:c0e0:104:5450:9727:2:7:b05:11210",
"path":"requestResponseDataMap.callBack[preactivaterequest_6edffd4aed8a4dceb79d3e03d328b619_5f38d4db3bd2434295cbbd47ae9d6067].requestFormatted",
"requestId":4289,
"requestType":"SubdocMutateRequest",
"retried":0,
"service":{"bucket":"db_om",
"collection":"_default",
"documentId":"messageEventDetails_d5a3888d2a434866845be96e750fd5e5",
"opaque":"0x10dd",
"scope":"_default",
“type":"kv"},
"status":"SUBDOC_FAILURE",
"subdocStatus":"PATH_INVALID",
"timeoutMs":2500,
"timings":{"dispatchMicros":298,
"encodingMicros":301,
"totalDispatchMicros":298,
"totalServerMicros":0,
"totalMicros":1151,
"serverMicros":0}}”,
“endOfBatch”:false,
“loggerFqcn”:“org.apache.logging.slf4j.Log4jLogger”,
“contextMap”:{“requestType”:“pre-activate”},
“threadId”:61,
“threadPriority”:5,
“date”:“2022-11-16T12:25:36.868+0000”}]

According to the documentation: The path’s syntax was incorrect

https://docs.couchbase.com/sdk-api/couchbase-core-io-2.0.7/com/couchbase/client/core/msg/kv/SubDocumentOpResponseStatus.html

thank you @mreiche for your time. have informed to our dev team same. let them fix this syntax issue.