How to Troubleshoot QuickBooks error code c=387?
                     How to Fix QuickBooks Error Code 
C=387?
It is Known as “Unexpected Error C=387,” 
QuickBooks error C=387 occurs when registry entries 
become damaged, corrupt, or outdated over time. 
Let's talk about QuickBooks Error Code C=387, which 
refers to an invoice template error. Many QuickBooks 
users have to deal with these errors that reduce their 
efficiency.
Solution 1: Refresh the system and Generate Invoices
QuickBooks error code c=387 can also be resolved by refreshing the system and 
generating some invoices.
You can create invoices by going to the Customers Menu. Click on Create Invoices.
You can choose from a variety of templates.
Please fill out the following information: Customer, item, amount.
Press the Delete button after clicking on Save.
Close the form by clicking OK.
Download the repair tool if this method does not work.
Solution 2: Download the Repair Tool
You can use the Repair Tool to resolve installation problems on your computer.
To The first thing you need to do is download the repair tool from the Quickbooks 
official website and transfer it to your machine.
To install the repair tool, double-click the installation file after downloading it.
Click 'Start Scan' to fix the error on your device.
The issue will be fixed once you click Next --> Repair Now.
The system should then be rebooted.
Solution 3: Troubleshoot the model Error
You can check if this option is inactive by going to Lists, then 
Templates.
● If this option is not available, go to Lists, then Templates.
● Now, choose the template with error in Template Window
● If this option is not available, go to Lists, then Templates.
To Conclude
It is possible for a user to be hampered by QuickBooks error 
code c=387, which can make bookkeeping difficult. The 
purpose of this blog was to explain what this error is, what its 
symptoms and causes are, and what we can do to fix it. This 
error occurs when a system registry entry becomes 
corrupted. Therefore, make sure you have made a backup of 
your data.