An attempt was made to perform na operation on a file that cannot be found in a specified location. This error can be triggered by a file open, read, or write procedure that could not access the specified file. The message contains the name of the file as it was declared in the source code. Please make sure the file is available in the specified directory. If the file location is not specified explicitly, i.e. only the file name is specified, make sure the file is available in the design working directory. If the file location is specified by using the value of a predefined variable, e.g. "$dsn/src_file.in", make sure the variable refers to a location in which the file is stored.