Hello, strange error occured today. I`m working with drawning and saw that i need make changes in assemble when I ctrl+tab to assemble and do changes and ctrl+tab back to SW show me error box "that something go wrong". But i can keep work with my draft I save and close SW. When i open this draft SW show me message: "error ocured when tried open file. Ask help in tech support." But if i try open draft in eDrawning it opens normaly. What`s happen?

Solidworks 17 sp2.