internal memory with problem | does not save or delete anything

After installing a custom kernel on my S4 MINI DUOS, it was not starting, so I came back with the kernel stock, but now I can not save, download, or delete files from the internal memory when I take a picture of the screen that appears
"Can not save the screen image. USB storage may be in use"

Also the camera also does not work, "camera error" among other problems as xposed accuses nd internal sd card

is there any solution to this problem? reinstalling the rom stock would cause the problem to be solved?

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