Report creation error - [_opendistro], must not start with '_'

Hi, we cannot create a report

Error message in browser:
“There was an error generating this report.”

Kibana exception in log:

{"statusCode":400,"responseTime":30,"contentLength":9},"message":"POST /api/reporting/generateReport?timezone=Europe%2FBerlin 400 30ms - 9.0B"}
{"type":"log","@timestamp":"2022-07-06T09:14:55Z","tags":["error","plugins","opendistroReportsKibana"],"pid":1018,"message":"{ **Error: [invalid_index_name_exception] Invalid index name [_opendistro], must not start with '_'.**, with { index_uuid=\"_na_\" & index=\"_opendistro\" }\n    at respond (/usr/share/kibana/node_modules/elasticsearch/src/lib/transport.js:349:15)\n    at checkRespForFailure (/usr/share/kibana/node_modules/elasticsearch/src/lib/transport.js:306:7)\n    at HttpConnector.<anonymous> (/usr/share/kibana/node_modules/elasticsearch/src/lib/connectors/http.js:173:7)\n    at IncomingMessage.wrapper (/usr/share/kibana/node_modules/lodash/lodash.js:4949:19)\n    at IncomingMessage.emit (events.js:203:15)\n    at endReadableNT (_stream_readable.js:1145:12)\n    at process._tickCallback (internal/process/next_tick.js:63:19)\n  status: 400,\n  displayName: 'BadRequest',\n  message:\n   '[invalid_index_name_exception] Invalid index name [_opendistro], must not start with \\'_\\'., with { index_uuid=\"_na_\" & index=\"_opendistro\" }',\n  path: '/_opendistro/_reports/on_demand',\n  query: {},\n  body:\n   { error:\n      { root_cause: [Array],\n        type: 'invalid_index_name_exception',\n        reason:\n         'Invalid index name [_opendistro], must not start with \\'_\\'.',\n     

opendistro version 1.13.2
elasticsearch version: 7.10.2

solution:
opendistro report plugin for kibana
needs
opendistro report schedule plugin installed on elasticsearch