I push the power and volume up buttons simultaneously but I only get a message saying couldn't take screenshot. Anyone know what to do?
I have experienced the same problem on my Lumia 430 running Windows Phone 8.1 several times. Just Restart the phone. It solved the problem each time it occurred.
try performing a power cycle on the device by removing the back cover, battery for about a minute and if still the same you might need to perform soft reset on the phone by holding down the volume down button and the power button at the same time, wait till the phone vibrates, when you feel the vibration from the phone release the buttons and the phone will automatically turn on by itself.
I had updated to windows 10 and experienced the same problem "couldn't take screen shot". I was so angry and I pressed the vol up+power button continuously for 8-10 times! triumph!!!! Everything started working fine just like normal.
Let the phone create the screenshot folder once. Rename the current folder to something, and check.
Switch off your phone and wait several minutes and switch it on it will work I have tried it
Try setting the default saving location to be the internal memory and not the SD card. Hopefully this helps. Good luck