Shulchan Aruch, Orach HaChaim, Siman 90, Seif 5
לֹא יִתְפַּלֵּל בְּמָקוֹם פָּרוּץ כְּמוֹ בְּשָׂדֶה, מִפְּנֵי שֶׁכְּשֶׁהוּא בִּמְקוֹם צְנִיעוּת חָלָה עָלָיו אֵימַת מֶלֶךְ, וְלִבּוֹ נִשְׁבָּר.
One should not pray in an open place, such as a field, for when someone is in an enclosed place, the fear of the King falls upon him and his heart breaks [in prayer].
Rabbi Nachman of Breslov in many places talks of the immense value of "hisbodedus" (solitary personal prayer) in the fields at night. I know Rabbi Nachman's teachings are still very controversial, but I am confused here and consider myself a follower and believer of most of his teachings and have indeed seen myself grow through this practice of hisbodedus.
So how can it be that Rabbi Nachman seems to contradict the Shulchan Aruch? I'm sure this question is raised to Breslover Chassidim quite often frequently. You can't just say that Rabbi Nachman wasn't aware of his halacha - perhaps the Shulchan Aruch is referring to the three communal prayers only? Someone help here!