Why cant I view transaction detail report in a PNL? When trying clicking on the amount, this is the error message "Something is wrong. We are working on it".

Are you using an app to create invoices or sales receipts? If so, these apps sometimes create a huge amount of entries that slow down the running of detailed P&L reports. Try running a "Profit and Loss Detail" report for a shorter date range, such as 12/1/18-12/12/18.