There are two options:
1.Delete the Report, start again and don’t delete fields, just change the font to white.
2.Correct the code in the Calc section. You can do this by going to the Report and going into the Calc tab of the report.

In the left hand side box, right click and select Events.

Here, you will be able to find an event (or a few events) with a red arrow next to it.

Click on the broken event and it will give you the code below, and the error at the bottom.
Usually the error at the bottom will say something like the error below. You can usually delete this line or put { } around the line.

Right click on the error and select Compile.

If all goes well you’ll get the message below. Check to see there are no more red arrows anywhere.

If there are multiple sub reports, these will need to be checked well.

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