Gmail error on page message

[dlmac]

I have been using Gmail for a couple of months. Today I started having problems. I can get to the main page where I log in, but instead of bringing up my mail, I get a message in the lower left (where often you see "done") that says "error on page." When it first started to happen, I could click the refresh button and suddenly my mailbox would appear, but by this afternoon, nothing works.