"no log data" gateway dashboard - POST ERROR: ENOENT [SOLUTION]

[SanG]

I am currently working on monitoring solar radiation data. I don't have any problem in collecting the pyranometer's raw output voltage (mV) data but I do have an issue with collecting solar radiation (W/m2) data. I have my Pi gateway set up in such a way that it collects various data including the above two: i) raw output voltage (mV) and ii) solar radiation (W/m2). Although Ithe gateway is updating the solar radiation (W/m2) data each time the node transmits the graph is not showing anything and it says "no log data" at the top left (see screenshot). This is the first time I have ever encountered this type of issue. Searched in google but couldn't find the relevant issue and the solution. Please help.

[Felix]

Check gateway.sys.log for any errors.
I would try to clear the binary file for that particular metric.

[SanG]

Hello Felix,
Thanks for such a prompt reply. I checked it and found that a repeating error that says:
[02-24-19_06:25:29.564] [ERROR]    POST ERROR: ENOENT: no such file or directory, open '/home/pi/gateway/data/db/0099_Solar Radiation (W/m2).bin'.
There are binary files for all other remaining metrics but couldn't find the file for that metric to delete.

Thanks

[Felix]

Error is self explanatory, likely because of the chars in the name.
I think you should try to rename the node/metric and exclude any special characters.
A possible fix in a future version will be to do that automatically when creating the db binary files.

[SanG]

 Great! It worked. I think it was the "/" in the metric name "Solar Radiation (W/m2)", as per your suggestion I renamed it to "Solar Radiation (Wm2)" and it is working now. 

Thank you Felix.