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). 1 headers I used to test the connections. The top and bottom values are your parts the middle value (0.038in) is from the.
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. 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.
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!). 005 in of the bottom of the pin will be truncated by Fritzing as being beyond the viewbox. If you select connector1pin the y coordinate is -0.005 in. 1 inch spacing (you need to account for the width of the lines when doing this though). An alternative is to set the tool bar to ‘in’ then check the x/y position of the various pins are all on. 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. That is likely because the page grid (at least for me on Inkscape 0.92.3) is set to px rather than in. 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.
(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.
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