[Newbies] Instability

[Overcomer Man]

When trying to measure a method from a fileIn by adding single quotes and
using size, the workspace somehow got into a state where it would generate
errors whenever I simply put the mouse into the workspace.  How does one fix
such things so as to guarantee it never happens when deploying an
application?  Is there a way to make Smalltalk as stable as a C, C++
application?
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