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Category: Common WHMCS Errors
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How do I enable the System Module Debug Log within WHMCS?
Enabling the System Module Debug Log within WHMCS can be useful if you're attempting to provision products and services …
Why am I seeing a ‘401,“message”:“Invalid Authentication”’ error?
You’ll usually see this error if your combined API key in your WHMCS installation doesn't  …
Why am I getting a ‘HTTP error 409’?
If you’re seeing an ‘HTTP error 409’ when trying to create a package - or are testing …