I have loaded this image on adobe stock contributor and they said that was not accepted because of technical reasons do you have any idea what they mean?
Apologies for the delayed response. Your preview is not big enough for me to analyse what the problem may be. We need the full resolution file here.
If you are new to stock, you should consider these resources: https://helpx.adobe.com/stock/contributor/tutorials.html
Please read the contributor user manual for more information on Adobe stock contributions: https://helpx.adobe.com/stock/contributor/user-guide.html
See here for rejection reasons: https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
and especially quality and technical issues: https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html
Can't tell much from low-res preview. But it looks like it might be underexposed.
Examine full sized images in Photoshop or Lightroom at 100-300% magnification. Check exposure level in the Histogram panel. Retouch defects if you can. Discard the ones you can't repair.
Adobe customers expect the highest visual and technical quality image for commercial projects. Submit only your best work.
Good luck with your next submission.