the problem of students get on-line is more and more popular这句话 有语法错误吗?改后的句子给我看看

有两处：
1.getting on-line应用非谓语动词形式
2.the problem is popular搭配不当，一般不用popular来形容problem，可以使用serious或obvious

把get改成
the problem of students getting on-line is more and more popular
popular没问题