Go to File > Prepare > Model Properties and click the blue change hyperlink to the right of Accuracy. Your model is probably set to the default values Relative and 0.0012.
Two choices: you can change that Relative value. I would recommend stepping down slowly, like 0.0010, then 0.0008, 0.0006, until the Extrude can be created. You can go down to a minimum Relative Accuracy of 0.0001.
Second choice: set the configuration option enable_absolute_accuracy to yes, and use the previous command to set Accuracy to Absolute and a value of 0.0003 (or lower).
Accuracy controls the smallest edges Creo Parametric is capable of seeing. If you have a large model and small features / dimensions, Creo might have trouble generating geometry.