Why Cannot Sql Server Open The File

I created a comma-seperated text file by exporting an Access table. I tried to bulk insert into into a SQL Server table using the following code:

BULK INSERT databasename.dbo.tablename FROM 'C:commaseparatedfilename.txt'
WITH (FIELDTERMINATOR = ';',
ROWTERMINATOR = '
',
FIRSTROW=2)

but it returns the following error:

Msg 4861, Level 16, State 1, Line 1
Cannot bulk load because the file "C:commaseparatedfilename.txt" could not be opened. Operating system error code 5(error not found).