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Hi Alfonso,
many thanks for choosing SphereTester!
This error occurs when MetaTrader is installed in the Program Files folder instead of the User Data Directory.
This can cause problems with other indicators and expert advisors as well, so I recommend that you reinstall MetaTrader or install a new instance after enbaling user account control on your computer.
First uninstall MT4 from your computer.
To enable User Account Control simply click on the start button and enter “uac” in the search box and hit enter. The UAC settings page will open, change the notification level to the default one (second from the bottom) and click OK.
Although not necessary I recommend that you restart your PC at this point and install the Metatrader after your pc has rebooted.
Once installed open the data folder from MT4 (File/Open Data Folder) and copy SphereTester in the experts folder.
More information on why this is necessary can be found here: https://www.mql5.com/en/articles/1388
Please let me know how you get on and if you require further assistance just ask.
I hope this helps.
Regards,
Jan