I open the MultipleRingBuffer and chose the Input Feature, which are lines, and give the output next to my polygons. I put a distance of 300 and choose meeter. I give it a simple Field Name and click okay.
Down at the Bottom i get the info that the tool worked out but the buffer it self dont show up on the map also not in the table of contents and it is not saved in my folders.
All my objects have the same projection.
What could be the Problem
probably in a different coordinate system.
Select the layer, right-click, zoom-to-layer ... if the buffers are present but somewhere else, pay attention to the coordinate system that you want to use for the final result
Also, run the Multipart to Singlepart tool on the input file, then run the multiring buffer on it. There were issues with multipart shapes in the past
show the tool inputs. The path and filename need to be checked.
Also files aren't automatically added to the display unless you have it set up under Project, Options, Geoprocessing
If it's a single buffer (e.g. 300 meters) that you are looking for, why don't you try Buffer (Analysis)—ArcMap | Documentation (arcgis.com)
Could you also check for any anomaly in geometry Check Geometry (Data Management)—ArcMap | Documentation (arcgis.com), and repair, if possible Repair Geometry (Data Management)—ArcMap | Documentation (arcgis.com)?