not sure what exact the problem is since you didn't provide the library info, but you can try:
1. reformat the library

libname mydir "catalog directory";
libname mylibrary (mydir);
proc format library=mylibrary cntlin=mydir.myformats;
run;

or

2. export the library then import the library

libname project "catalog directory";
filename outfile "temp location/cport file.cpt";
proc cport library=project file=outfile;
run;

Good luck!

谢谢，大神，我的启动代码是libname datasamp "/Workspace/Sas/data_samp"；而且我通过在新建里面建逻辑库也把该路径命名为samp了。
以前用过EM，都是work的。这次，能打开其他的数据源，但就我想用的这个打不开。
同目录下有多个文件，文件1和文件2都能通过“创建数据源”来引入打开，就我这个文件3会报错，但是文件格式都是sas的data文件。我现在感觉是不是和启动代码的路径无关呢？
对文件有要求吗？我文件名sta，文件里就俩变量，appl_type_cd 和lgd，format一个是字符，一个是w8.4的数值型

It may be related to variable formatting of your raw data, so add one line of code below at the head of your program and try again, good luck!

option nofmterr;

When creating a data source in SAS® Enterprise Miner™, you might receive the following error:
Advisor Error: SAS Formats for this table could not be located.
Make sure their location is in the format search path.
You can add this code to the project start-up code.
The problem occurs if formats (or informats) are assigned to variables in the data set, and those formats are not available to SAS Enterprise Miner. (Note that specifying the SAS option NOFMTERR in the Project Start Code does not correct the problem.)
To circumvent the problem, either point to the location of the formats (or informats), or disassociate the formats (or informats) from the data.



Point to the location of the formats. In the Project Start Code, add a LIBNAME statement to allocate the format library. Add an OPTIONS statement to specify a FMTSEARCH= search path that points to the library that you just allocated.  To access the Project Start Code, click the project name in the project panel (upper left corner of the user interface).  Then, click Project Start Code in the properties panel (middle left).

Example:

libname mylibrary "c:\my_format_library";
options fmtsearch=(mylibrary work library);

Disassociate the format (or informat). One reason to disassociate is that you no longer have access to the format catalog. You can remove the format (or informat) from the variable in that data set using PROC DATASETS.

Example:


proc datasets lib=mylibrary;
    modify mydata;
   format myvariable;
   informat myvariable;
   quit;
In the above example, the format (and informat) is removed only from the variable MYVARIABLE. All other variables maintain their format (and informat). You can also specify FORMAT _ALL_ within DATA step code to remove formats from all variables in the data set. FORMAT _ALL_ removes not only user-defined formats, but also removes SAS specific formats (such as date formats). Likewise, you can specify INFORMAT _ALL_.

Example:

data mylibrary.mydata;
   set mylibrary.mydata;
   format _all_;
   informat _all_;
   run;

For more information about formats, see Base SAS documentation.