[Plugin: Drain Hole] My drainhole statistic graphs do not work anymore?

I have been using drainhole for several years without any changes to my files but for the last few months, the graphs and charts no longer work at all. 3 years of charts all show the same thing, doesn’t matter if view individual file charts or whole drainhole charts.

Two screenshots are attached showing what all the charts now look like.

My drainhole files continue to work and I have hundreds of downloads per day I just can’t view any of the stats anymore, which I would really like as the monthly numbers were important for me to track and I can no longer access them.

I do have a warning on the drainhole admin area screen showing:
Your chosen directory is within a publicly accessible web directory. Drain Hole will not be able to control access to files placed here unless a .htaccess file is placed in the directory. Drain Hole will attempt to do this for you, but may not have permission to do so. If this is the case then you will need to create this file yourself (click to view)

I can’t seen to fix that error message but it has always been there and never affected my charts or file downloads in drainhole before.

Please help as I’d love to have these statistics back working.
Thanks,

Mike