it means that u encounter a number of difficulties or things run into trouble,and u got stuck
for example
we encounter a number of difficulties in the first week 我们在第一周遇到了一些困难
At first things went well,but late on we ran into troubles. 起初事情进展得很顺利,可后来我们遇到了困难
hey,bro.i hope that u will understand my writing and thats works on u.keep going