Default [Q] Size of image is too big, please select a smaller one error.!!

Hello guys., greetings,
i own a sony xperia acro s. thing is, when i enter into messages, or whatsup or albums, or file explorer it throws me an error like "SIZE OF IMAGE IS TOO BIG, PLEASE SELECT A SMALLER ONE" .. Actually i have no idea about why that error comes.. so fed up i couldn't message or view photos anything... can anybody please help me to clear this error..

I didnt attach any file for MMS, or didnt copy any big sized image..!! please help me guys..

thanks in advance..