If these are your first parts you are doing very well. Part creation is a complex process and takes a while to learn, in addition it is poorly documented 
meaning asking here for help is pretty much the only way to learn at present. The new parts are mostly fine, but there are several problems. In this part (the bmp280) the fzp file has the schematic layerId as the standard ‘schematic’ but in the schematic svg the layerId is spelled ‘Schematic’ and thus there isn’t a layerId because it doesn’t match (case matters!). This is an error (as opposed to a warning) because it will stop your part from appearing in an export of the sketch to a pdf or other image file. There are a bunch of warning message about various things (such as scale) but they won’t affect the operation of the part. I am using the parts checker available from
(although a not yet released, later version, the github version will complain about less at the moment) to see what problems there are as well as looking at the result in Fritzing. In Fritzing we see there is a problem that the part checker didn’t catch in schematic if you load the part in to fritzing you will see the pins in schematic don’t align to the grid properly. That is likely because the page grid (at least for me on Inkscape 0.92.3) is set to px rather than in. If you reset the grid units to ‘in’ from ‘px’ file->document properties->grids and then adjust the Spacing in x/y from 0.01042 to 0.01 you will see the misalignment. An alternative is to set the tool bar to ‘in’ then check the x/y position of the various pins are all on .1 inch spacing (you need to account for the width of the lines when doing this though). As well the viewbox is slightly wrong. If you select connector1pin the y coordinate is -0.005 in. That means .005 in of the bottom of the pin will be truncated by Fritzing as being beyond the viewbox. The easy way to fix that is to Edit->select all then in document properties->page click Resize page to content to readjust the view box to match the drawing (after realigning the pins!). According to the part check script the 4n25 part is fine, no errors, only a bunch of warnings which won’t affect the operation of the part but the script, lies . It has failed to flag that ‘copper1’ is the layerId in the fzp file but in the pcb svg it is spelled ‘cooper1’ which means the 4n25 part has no top layer pads (the script should have flagged a missing layerId, I’ll have to fix that.) In addition, the pcb hole sizes (from the gerber output drill file Untitled Sketch_drill.txt are incorrect.
T100C0.039685
T101C0.038000
T102C0.039657
The top and bottom values are your parts the middle value (0.038in) is from the .1 headers I used to test the connections. You need to adjust the size of your pads to be 0.038 or a little less (because the typical board house will round up to the next highest drill size making your hole too large). The hole size (in Inkscape, the others are different I think) is pad diameter - (stroke-width * 2). At the usual scale that means pad diameter is .078in and stroke-width is 20 to give a .038 hole. You would need to scale these numbers to match the scale in your drawing.
Peter