ScriptError 
                This error variable returns the error code of the last executed script statement.
Syntax:
ScriptError
This variable will be reset to 0 after each successfully executed script statement. If an error occurs it will be set to an internal Qlik Sense error code. Error codes are dual values with a numeric and a text component. The following error codes exist:
| Error code | Description | 
|---|---|
| 0 | No error. Dual value text is empty. | 
| 1 | General error. | 
| 2 | Syntax error. | 
| 3 | General ODBC error. | 
| 4 | General OLE DB error. | 
| 5 | General custom database error. | 
| 6 | General XML error. | 
| 7 | General HTML error. | 
| 8 | File not found. | 
| 9 | Database not found. | 
| 10 | Table not found. | 
| 11 | Field not found. | 
| 12 | File has wrong format. | 
| 16 | Semantic error. | 
Example:
set ErrorMode=0;
LOAD * from abc.qvf;
if ScriptError=8 then
exit script;
//no file;
end if