X1026 File not found '%s' (Delphi)
Go Up to Error and Warning Messages (Delphi)
This error message occurs when the compiler cannot find an input file. This can be a source file, a compiled unit file (.dcuil file), an include, an object file or a resource file.
Check the spelling of the name and the relevant search path.
program Produce; uses Borland.Vcl.SysUtilss; (*<-- Error message here*) begin end.
program Solve; uses Borland.Vcl.SysUtils; (*Fixed typo*) begin end.
For a .dcuil file, failure to set the unit/library path for the compiler is a likely cause of this message. The only solution is to make sure the named unit can be found along the library path.