This error is showing while download the report from jira "An unknown error occurred while trying to perform a search."
And in Trouble and shoot option getting this
This suggests you have a damaged data set somewhere.
You'll need to read the application log to get started debugging this.
can you please help me from where I get the log file in linux server
Sorry, I should have said - <jira home>/logs/atlassian-jira.log is the first place to look
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