Wii "An error has occured" when disc is inserted.

I Had the same thing happen! It has to do with the retention clip. Here you go:
How to Fix Wii Disk Read Errors Game Front
After you fix it, don't leave game disks overnight or in for extended periods of time as that pulls the clip down.

it may be your wii. first, check on another game. then, if it's still not working, then you havve to send t out too get fixed or buy a new wii.

Unable to Read the Disc" Error, or Disc Not Recognized (Will Not Play Game Discs) Situation:

• The Wii console will not play game discs (disc is not recognized)
• System displays either error message "Unable to read disc" or "Disc could not be read"

Important!

• If this problem happens very infrequently, it is normal and does not indicate a problem. A Wii Lens Cleaning Kit can be purchased to help keep the lens clean and prevent the situation from worsening over time.


• Wii Game Discs are region locked, and can only be played on hardware from the same country where the game was released. (A European game cannot be played on a North American system, for example.)

What To Do:

• The Wii console is only compatible with Wii and GameCube discs. It is not compatible with DVDs or discs made for other home consoles. Verify that the disc you are inserting is compatible with the Wii system.


• An error message may display if the disc is ejected during play. Return to the HOME Menu before changing discs.


• Verify that the console is placed correctly.


• If the Wii console is lying flat, the game disc slot should be above all three buttons and the SD Card slot.


• If the Wii console is standing vertically, the power button should be on the top and the console should be in the stand. Note: Only Wii consoles with model number RVL-001 are intended to be placed vertically. (Learn more)


• Verify that the disc is being inserted properly.


• If the console is placed horizontally, the disc label will face upwards.


• If the console is placed vertically, the disc label will face to the right.



• Check the non-printed side of the game disc for dirt or severe damage (such as scratches or cracks).


• If the disc is dirty, try cleaning the game disc. (How to)


• If the disc is damaged or scratched, it will need to be replaced. Please click here for replacement options.


• If the problem occurs with only one game disc, there may be a problem specific to that game. Click here to check our list of specific game issues.


• Make sure only licensed accessories are being used. Unlicensed products do not undergo Nintendo's testing and evaluation process. They may not work at all with our game systems, and they may have compatibility problems with certain games or accessories.

Situation Not Resolved:

How many games does this occur with?

• One Specific Game
• You Only Have One Game
• Some Games / All Games

Situation:

• System displays either error message "Unable to read disc" or "Disc could not be read"

What to do:

• This message may display if the disc is ejected during play. Return to the HOME Menu before changing discs.
  
  
• If the Wii console is laying flat, verify that the system is not placed upside-down. The game disc slot should be above all three buttons and the SD Card slot.
  
  
• Verify that the disc is being inserted properly.
  
  • If the console is placed vertically, the disc label will face to the right. Note: Only Wii consoles with model number RVL-001 are intended to be placed vertically (learn more)
    
    
    
  • If the console is placed horizontally, the disc label will face upwards.
    
  
  
• If the problem occurs with only one game disc, there may be a problem specific to that game. Click here to check our list of specific game issues.
  

Situation Not Resolved:

• If only one Game Disc displays this error message, it will need to be replaced. Click here for Game Disc replacement options
  
  
• If the error is occurring with most or all Game Discs or all of one type of game, then this indicates a problem with the system. The console and one or two example discs will need to be sent in for repair. Click here to begin the repair process.
  

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Unable to Read the Disc / Disc Could Not Be Read Situation:

• System displays either error message "Unable to read disc" or "Disc could not be read"

What to do:

• This message may display if the disc is ejected during play. Return to the HOME Menu before changing discs.
  
  
• If the Wii console is laying flat, verify that the system is not placed upside-down. The game disc slot should be above all three buttons and the SD Card slot.
  
  
• Verify that the disc is being inserted properly.
  
  • If the console is placed vertically, the disc label will face to the right. Note: Only Wii consoles with model number RVL-001 are intended to be placed vertically (learn more)
    
    
    
  • If the console is placed horizontally, the disc label will face upwards.
    
  
  
• If the problem occurs with only one game disc, there may be a problem specific to that game. Click here to check our list of specific game issues.
  

Situation Not Resolved:

• If only one Game Disc displays this error message, it will need to be replaced. Click here for Game Disc replacement options
  
  
• If the error is occurring with most or all Game Discs or all of one type of game, then this indicates a problem with the system. The console and one or two example discs will need to be sent in for repair. Click here to begin the repair process.

1. Refer to the Wii operations manual.
2. Try cleaning the disc with a lint-free cloth. Wipe the disc in strait lines, not in a circle.
3. Don't move the Wii around while there is a disc in it. Do this to prevent further damage.
4. Try a different disc, preferably one that is much cleaner. If it doesn't work, there is an internal error with the Wii.

Hi,

Some older Wii units also have trouble with Dual Layer Discs, which pack more info onto a disk like Super Smash Bros. Brawl and Metroid Prime. If your Wii is having trouble reading a dual layer disc you can try Nintendo's Wii lens cleaning kit. the other resolution for this is to change the laser on the system but it will cost you for that. Try to clean the lens first it might read the new disk.

Thanks for using Fixya.

U are probably putting in the disc in the wrong way. I had the same problem just flip the disc and insert it in your wii.

it migth be upside down game broke or it is a burned disk and it can not be used anymore can u help me with my wii promlem too here is my problems link

"Unable to read the disc" / "Disc could not be read" / "Eject the Game Disc" Error Message.
If you are getting one of the above error messages:

• Ensure that you are properly loading a Game Disc.
  • If your console is placed vertically, the disc label will face to the right.
  • If your console is placed horizontally, the disc label will face upwards
  
  
  
• If you know you are inserting the Game Disc correctly, but are still have the same problem with only one game (or if you only have one game), try cleaning the Game Disc by following the disc cleaning procedures
• 
  If after reading the above information you are still unable to play a game disc, please call 1-800-255-3700 to discuss available options.

:)