Dave who? And code 400 sounds like an HTTP status error. If you're dealing with websites or API endpoints, it usually suggests a "Bad Request" issue. It means that the API call was not correctly formatted and there may be something wrong with the syntax of your request.

In other contexts, Code 400 could refer to Internet Comp History Unit (ICHU) codes linked towards representing complex data metrics attainable from specified measurements identification techniques applied within advanced metric sources collecting estimates invariant analysis applying definitions relative calibratory efficiency measures delineated into predefined expressions of accuracy as well