# Use Files in 8M Nano **URL:** \ **Category:** Linux\ **Tags:** linux, integrado-\ **Created:** [September 15, 2020, 9:45am UTC](https://forums.digi.com/t/use-files-in-8m-nano/21774 "2020-09-15T09:45:47Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![lalvarez](https://avatars.discourse-cdn.com/v4/letter/l/ecb155/32.png) [@lalvarez](https://forums.digi.com/u/lalvarez)\ **Post date:** [September 15, 2020, 9:45am UTC](https://forums.digi.com/t/use-files-in-8m-nano/21774/1 "2020-09-15T09:45:47Z")
I am using the 8m nano development kit. I want to use files, but the open function gives me the error: warning: implicit declaration of function ‘open’; did you mean ‘popen’? [-Wimplicit-function-declaration] 43 | fd\_Serial = open (MODEMDEVICE, O\_RDWR | O\_NOCTTY); also with the types O\_RDWR | O\_NOCTTY. In my main.c I have included #include #include . When I try to search the module with the find command, it returns the following error: root @ ccimx8mn-dvk: / usr # find / -type f -name “types.h” [1152.265429] EXT4-fs error (device mmcblk0p3): htree\_dirblock\_to\_tree: 997: inode # 10378: comm find: Directory block failed checksum ---
**Author:** ![lalvarez](https://avatars.discourse-cdn.com/v4/letter/l/ecb155/32.png) [@lalvarez](https://forums.digi.com/u/lalvarez)\ **Post date:** [September 15, 2020, 10:00am UTC](https://forums.digi.com/t/use-files-in-8m-nano/21774/2 "2020-09-15T10:00:46Z")
I have solved the problem with the open function. But the error when I do a find on the module, I would like to know what it is.