Let's work together, Kate. I'm here to ensure everything goes smoothly.

The error you receive indicates something you're trying to use has been made inactive. To resolve this, check the fields related to accounts, customers, items, vendors, or employees. 
 

To check if the vendor or supplier selected is inactive, follow these steps:

1. Navigate to the Expenses menu, then Suppliers.
2. Look for the person you're trying to send a remittance.
3. If they are not on the list, click the small Gear icon.
4. Tick the Include Inactive option.
5. Scroll down and find your supplier.
6. Hit Make active.

Now, let's confirm the account you've chosen is active.

1. Hover to the Transactions menu. Click the Chart of Accounts tab.
2. Locate the account. If it's not on the list, press the small Gear icon.
3. Tick the Include Inactive option.
4. Find the account and select Make active.

Meanwhile, make sure you have enable batch payments feature first when you create a bank file. Please follow these steps if you haven't done this.

1. On the Chart of Accounts page, locate your bank.
2. In the Action column dropdown, select Edit.
3. Tick the box I create batch payments for this account.
4. Fill in the relevant information for your bank. Save and Close.

Refer to this article for more details: How to enable batch payments or create ABA Files. 

If the issue remains after confirming the suppliers and accounts are active, I suggest contacting our customer care team. Our experts can further diagnose this matter. 

You might want to learn how to manage vendors or suppliers including chart of accounts in QuickBooks Online. See these articles for more reference: 
 

• Handle supplier refunds and credits.
• Run a report with supplier totals.
• Learn about the chart of accounts.
   

After you've followed the recommended steps, I hope everything works out smoothly. I'm dedicated to ensuring you receive the necessary support, so keep me updated on how things are going.