Why does my Micromax Canvas Fire 4 show 'directory is not available' when going to storage from phone to SD card?

I have set sd card as default write disk . But when I am going to change stotage from phone to sd card it shows 'directory is not abailable'.how can i solve the problem...? canvas fire 4

Hi Affan. Check if your phone detects your SD card. I think phone doesn't detect it that's why it's showing that.

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