Not able to create new simple report

Document ID : KB000097902
Last Modified Date : 25/05/2018
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Not able to edit or create a new simple report, because he cannot select a value from the drop down menu in the field: by
It is empty, but it is required for the report.

1. go to Reports folder
2 select " add new"
3. select "simple report" from the drop down list
4 takes a while to load the report wizard.
5. then he gets a popup message " a script error has occurred please inform your system administrator"
6 Click ok and it continues to load the report wizard
Once loaded customer selects Service Level(for simple report type) (which is always the type they use for reports)
By: drop down is blank - should show by month by hour by week - but it is completely blank.

The error message received shows out of memory errors but there seems to be enough memory and the report generation is not getting that far..

General/OE_SYSTEM_ERROR GUI; ASP.s2sservices_clienterrorlogservice_aspx; P "c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NETFiles\root\fad9a759\8095a752\App_Web_t2zoybb5.8.csProcessRequest0
Problem occurs when there are over 65535 metrics with a measurability status of Active. This error can be removed by marking unused metrics as inactive.