The common fault of scientists is the misperception that every problem has a technical solution.
Literal
Scientists [possessive-の] common-fault [topic-は], every problem [to-に] technical solution [subject-が] exists [quotative-と] misperceive [nominalizer-こと].
A pithy intellectual observation. 通弊 ('common fault, besetting defect') is a formal word — 通 'common' + 弊 'fault.' あらゆる ('every, all possible') is more emphatic than すべての. 誤認する ('to misperceive') is similarly formal. The A は B こと structure cleanly equates the fault with a nominalized action.