I have space in my computer also in my G drive
You should check the export manager https://www.construct.net/make-games/manuals/construct-3/interface/dialogs/export-manager and make sure to make space in there.
thanks for the quick response now it gives another error while building the export. unable to write project to disk
I've been having the exact same issue. Which is strange because it was working alright some hours ago.
Deleting everything on the export manager did not solve the issue.
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Then best next thing is to make a report following the guidelines: https://github.com/Scirra/Construct-3-bugs
I sometimes have this problem when I’m using Construct in Chrome. Try emptying your browser cache etc, restart Construct and try exporting again.