Quickbooks File Repair — Error code: C=315

QuickBooks error C=315 is an "assertion failed" miscellaneous error that is often data-related and frequently cleared by rebuilding the data, though it can also stem from a damaged list, low memory, or a software conflict. Because it is a catch-all assertion, the exact trigger varies, but it usually points either at a list problem or at resource pressure on the machine. It appeared most in older QuickBooks versions running on older Windows releases.

What C=315 means

An assertion failure means QuickBooks reached a state its code did not expect and stopped to avoid acting on bad data. With C=315 that unexpected state is commonly damage in a list or a transaction, which is why a rebuild so often resolves it. When the rebuild does not, the cause tends to be environmental rather than the file.

Symptoms you'll typically see

• The error appears during list activities, such as opening or running a list report.
• QuickBooks may crash or freeze on the same action repeatedly.
• The problem eases when other programs are closed, hinting at low memory or a conflict.
• It shows up most on older QuickBooks and Windows versions.

Common causes

• A damaged list inside the company file.
• General data damage that a rebuild can correct.
• Low available memory on the machine.
• A conflict with another running program.

What you can safely try first

Work from a backup copy and start with the most common fixes:

• Run File > Utilities > Rebuild Data, which resolves many C=315 cases.
• If the error hits a specific list, use Re-sort List on that list.
• Shut down other programs to rule out low memory or a conflict, then test whether the problem disappears.
• Restart Windows to free resources before reopening QuickBooks.

When professional recovery is the safer path

If a rebuild and a list re-sort do not clear C=315, and closing other programs makes no difference, the list or transaction damage may be beyond what the in-product tools can reach. Repeated rebuilds on a stubborn file can compound the damage. Our engineers repair the affected lists and records at the database level and return a verified file, so you keep your data instead of recreating lists by hand.

When the built-in tools stall, our QuickBooks data recovery team can help, and you can start a recovery whenever you need. All work is done in-house in North America under our no-data, no-charge policy.