Question vertex Weight Problems

so i have tried a few ways to fix this, including exporting via FBX and importing the .Blend File but neither of these worked, i have also changed the priority to a higher number, ive set the quality in "mesh Renderer" to auto and tried using more bones in the Skin Weights drop down, however it still keeps coming out like this. please is there any suggestions? I am loosing so much time trying to fix this.