Uncaught error fetching image? Help appreciated.

Hello. I'm currently working on a simple game that is quite similar to Minesweeper. There are 25 JPanels that show an image when they are clicked, the object being to find all the gophers. Everything is working fine, but for some reason I'm getting an error when an image tries to load. This happens randomly throughout the game, with some loading and then crashing when the error appears. The error I get is the following:
Uncaught error fetching image:
java.lang.NullPointerException
        at java.io.FileInputStream.<init>(FileInputStream.java:103)
        at java.io.FileInputStream.<init>(FileInputStream.java:66)
        at sun.awt.image.FileImageSource.getDecoder(FileImageSource.java:35)
        at sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.java:240)
        at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:172)
        at sun.awt.image.ImageFetcher.run(ImageFetcher.java:136)I'm currently using a modified version of Random that someone created, that makes sure values in a certain range are not repeated, to assign strings containing the image file's name randomly across the JPanels. Here's the method that I'm using to assign the strings:
    public void Generate() {
        for(int i = 0; i <= 24; i++) {
            if(i < maxGophers)
                imageName = "gopher.jpg";
            else if(i < maxGophers+maxWolves && wolvesJCheckBox.isSelected())
                imageName = "wolf.jpg";
            else if(i > maxGophers)
                imageName = "hole.jpg";
            switch(generator.getNextInt(26)) {
                case 1: panel1 = imageName;
                        break;
                case 2: panel2 = imageName;
                        break;
                case 3: panel3 = imageName;
                        break;
                case 4: panel4 = imageName;
                        break;
                case 5: panel5 = imageName;
                        break;
                case 6: panel6 = imageName;
                        break;
                case 7: panel7 = imageName;
                        break;
                case 8: panel8 = imageName;
                        break;
                case 9: panel9 = imageName;
                        break;
                case 10: panel10 = imageName;
                        break;
                case 11: panel11 = imageName;
                        break;
                case 12: panel12 = imageName;
                        break;
                case 13: panel13 = imageName;
                        break;
                case 14: panel14 = imageName;
                        break;
                case 15: panel15 = imageName;
                        break;
                case 16: panel16 = imageName;
                        break;
                case 17: panel17 = imageName;
                        break;
                case 18: panel18 = imageName;
                        break;
                case 19: panel19 = imageName;
                        break;
                case 20: panel20 = imageName;
                        break;
                case 21: panel21 = imageName;
                        break;
                case 22: panel22 = imageName;
                        break;
                case 23: panel23 = imageName;
                        break;
                case 24: panel24 = imageName;
                        break;
                case 25: panel25 = imageName;
                        break;
            } // end switch
        } // end for
    } // end method Generate{code}This is the code I'm using to load the images once the JPanels are clicked:
{code:java}        imageIcon = new ImageIcon(panel1);
        image = imageIcon.getImage();
        Graphics g = blankJPanel1.getGraphics();
        g.drawImage (image, 1, 1, blankJPanel1);{code}There's also a JButton that draws all the associated images on all the panels, but that gives the error as well, drawing only some until it encounters it.
I'm quite sure this isn't the most efficient way to go about it, so I'm open to any changes and suggestions. Thanks to anyone who can help!

There are 25 JPanelsYou need to hold them in an array. All that panel1, panel2, ... panel25 business is a waste of time and space.
java.lang.NullPointerExceptionSo something is null that shouldn't be.
imageIcon = new ImageIcon(panel1);
image = imageIcon.getImage();
Graphics g = blankJPanel1.getGraphics();
g.drawImage (image, 1, 1, blankJPanel1);i.e. one of those variables.

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