Updated 1. Installation (markdown)

1.-Installation.md

@@ -29,7 +29,7 @@ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:[ODM-PATH]/SuperBuild/install/lib
 
 ### Common Problems with install:
 
-If you get the error `ImportError: No module named ecto`
+###### If you get the error `ImportError: No module named ecto`
 - Make sure your environment variables are set correctly. 
 - You can replace `python run.py` with `./run.sh` followed by your normal parameters and that will set the environment variables for that run. 
 
@@ -43,3 +43,9 @@ If you get `[ERROR]   You must put your pictures into an <images> directory`, yo
 |-- gcp_list.txt
 ...
 ```
+
+If you get `ImportError: No module named csfm`, your install of OpenSfM may have failed:
+```
+cd /pat/to/OpenDroneMap/SuperBuild/src/opensfm
+python setup.py build
+```