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# Oracle® Database 11g / 12c / 18c error codes ORA-40024: solution to least squares problem could not be found

## ORA-40024: solution to least squares problem could not be found

Oracle Error Code: ORA-40024

### Cause: Unable to find solution because the predictor covariance matrix was singular.

### Action: Enable ridge regression or remove exact multicollinearities from the build data.