troubleshooting.md

-to do...
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+If the toolbox does not load properly, it will be indicated with an exclamation mark as: 
+
+![image](/uploads/c5659604d69078ea14067ac30e0da05e/image.png)
+
+To identify the problem, right-click the toolbox and select "Check syntax...": 
+
+![image](/uploads/f62c5b4031f5d9223ef3e2d21fff473c/image.png)
+
+This will display any syntax errors. Below are a few errors listed with hints on how to (hopefully) fix them. 
+
+## ModuleNotFoundError
+If the error is on the form "ModuleNotFoundError: ...", like this: 
+
+![image](/uploads/e75cd631636c7cecfc03ba529b1aa37c/image.png)
+
+the reason is likely that the python environment is not setup correctly. Try the following: 
+
+### 1: Assert that the vpi-environment is selected
+
+
+### 2: Re-build the vpi-environment
+
+
+