Sometimes this may happen to you where you cannot install any apps from the Play Store or get error messages while trying to download apps after installing a new custom ROM on your Android smartphone.
Usually, this problem can be fixed by wiping cache and dalvik cache in CWM (ClockworkMod) Recovery and rebooting.
Why does this happen?
Cache and Dalvik cache are “temporary files” that reside in your Android operating system. Sometimes, they can still contain old data from you