How to fix the error in WHMCS if you got :
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The very easiest way to check what cause this. Why this error coming. You can now very easy without any developer help follow the below easy steps.
Step 1). Login to your WHMCS Admin Area.
Step 2). Navigate Setup Tab than click on General Setting Tab than click on Other tab.
Step 3). On Other tab you should find the four debug checkboxes. Click on these checkboxes and reload the page where you are getting the error. After that, you can see the error.