When looking for xrefs to a string in memory, I keep getting the following error:

Found no sources on it online, any direction on what might be the cause & how to fix?
Note: I use ida freeware 7.0, Windows 10
When looking for xrefs to a string in memory, I keep getting the following error:

Found no sources on it online, any direction on what might be the cause & how to fix?
Note: I use ida freeware 7.0, Windows 10
I had the same problem with IDA Freeware 7.0. Reinstallation did nothing.
Downloading qwingraph from an external source fixed it for me. You can either compile it yourself from the official source or download an executable file from a repository.
Once you have the executable (qwingraph.exe), place it in your IDA home directory (e. g. C:\Program Files\IDA Freeware 7.0).
Note: If qwingraph.exe is downloaded from the repository linked above, the QtCore4 and QtGui4 dlls (which can be found in the same repository) might also be mandatory. That is so because the executable uses Qt4, and recent versions of IDA Freeware use Qt5, thus causing an incompatibility.
Reinstall IDA Freeware 7.0, you should have qwingraph.exe in your IDA Freeware directory.