Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
LCK references a Lock file. Generally lock files, when present, mean that a file (with the same name as the *.lck Lock file) is opened for writing, and the lock file being present denies other attempts to write to the file.
As for 'access denied', that means that permissions to access or write to the location is denied, for whatever reason.
And 'file location' means, to me, that you need to check whether the location you are trying to write to, is the one you mean to write to (which is also what the 'access denied' could mean.
Or it could mean that a .lck file is present and disallows Access to the file location.
Is it only one page you are writing to the site from Dreamweaver? if so, then you can check whether there is a .lck file in the site with the same name as the page you are trying to write, and try deleting that .lck file. That might free up write access so you can 'put' to that page again from DW.
And also, check whether (somehow) the intended location you are trying to 'put' the page into, is the right location... that pointer or address may have changed, spontaneously, somehow.