APM Service Map Internal Server Error

The service map of APM module in kibana(7.8.0) is wrong, and other functions of APM are normal
error log in kibana:
//-------------------
log [12:31:19.820] [error][http] { Error: [resource_not_found_exception] No known job with id 'apm'
at respond (/opt/kibana-7.8.0-linux-x86_64/node_modules/elasticsearch/src/lib/transport.js:349:15)
at checkRespForFailure (/opt/kibana-7.8.0-linux-x86_64/node_modules/elasticsearch/src/lib/transport.js:306:7)
at HttpConnector. (/opt/kibana-7.8.0-linux-x86_64/node_modules/elasticsearch/src/lib/connectors/http.js:173:7)
at IncomingMessage.wrapper (/opt/kibana-7.8.0-linux-x86_64/node_modules/elasticsearch/node_modules/lodash/lodash.js:4929:19)
at IncomingMessage.emit (events.js:203:15)
at endReadableNT (_stream_readable.js:1145:12)
at process._tickCallback (internal/process/next_tick.js:63:19)
status: 404,
displayName: 'NotFound',
message:
'[resource_not_found_exception] No known job with id 'apm'',
path: '/_ml/anomaly_detectors/apm',
query: {},
body:
{ error:
{ root_cause: [Array],
type: 'resource_not_found_exception',
reason: 'No known job with id 'apm'' },
status: 404 },
statusCode: 404,
response:
'{"error":{"root_cause":[{"type":"resource_not_found_exception","reason":"No known job with id 'apm'"}],"type":"resource_not_found_exception","reason":"No known job with id 'apm'"},"status":404}',
toString: [Function],
toJSON: [Function] }
error [12:31:19.757] Error: Internal Server Error
at HapiResponseAdapter.toInternalError (/opt/kibana-7.8.0-linux-x86_64/src/core/server/http/router/response_adapter.js:69:19)
at Router.handle (/opt/kibana-7.8.0-linux-x86_64/src/core/server/http/router/router.js:163:34)
at process._tickCallback (internal/process/next_tick.js:68:7)
//-------------------
kibana web error
image

Please give me some advice!

This is a known issue in 7.8.0. A workaround is to create an ML job or to upgrade to 7.8.1 or newer.