error on load

[Anniepoo]

ERROR: c:/program files/swipl/pack/julian/prolog/julian.pl:29:
Wrong context: type/1 can only be used in a directive
Warning: c:/program files/swipl/pack/julian/prolog/julian.pl:29:
Goal (directive) failed: julian:type(--->(duration, (days(integer);s(integer);ms(integer);ns(integer))))

[mndrix]

It looks like you need to install the typedef pack. Does that resolve the problem?

[Anniepoo]

no, I had typedef installed , reinstalling does not help

[mndrix]

I'm unable to reproduce the problem locally. Can you provide a minimal file that exhibits the problem for you? I tried use_module(library(julian)) and variations.

It looks like something is preventing term_expansion from executing for the typedef package. That leaves type/1 to execute as a goal which throws the exception you see.

[chiahli]

Hi, i am too experiencing the same error message.

?- use_module(library(julian)).
ERROR: /Applications/SWI-Prolog.app/Contents/swipl/pack/julian/prolog/julian.pl:29:
Wrong context: type/1 can only be used in a directive
Warning: /Applications/SWI-Prolog.app/Contents/swipl/pack/julian/prolog/julian.pl:29:
Goal (directive) failed: julian:type(--->(duration, (days(integer);s(integer);ms(integer);ns(integer))))
true.

I wonder if this is an issue that caused the following example from your tutorial on RFC3339 not working properly?

?- form_time(now, _T),
| form_time(rfc3339(RFC), _T).
_T = datetime(57391, 13058276446208),
RFC = [50, 48, 49, 54, 45, 48, 49, 45, 48|...].

[mndrix]

i am too experiencing the same error message

I'm still not able to reproduce this problem locally. Which version of SWI-Prolog are you using? What output do you get when you run the following command:

swipl -f none -g 'use_module(library(julian)), writeln(ok).' -t halt

[chiahli]

version 7.2.3 for mac.

Here's the output.
?- swipl -f none -g 'use_module(library(julian)), writeln(ok).' -t halt.
ERROR: Syntax error: Operator expected
ERROR: swipl -f
ERROR: ** here **
ERROR: none -g 'use_module(library(julian)), writeln(ok).' -t halt .

Managed to get around the issue by assuming it could be a string thing:
?- form_time(now, _T), form_time(rfc3339(RFC), _T), string_codes(String, RFC).
_T = datetime(57390, 61834954753024),
RFC = [50, 48, 49, 54, 45, 48, 49, 45, 48|...],
String = "2016-01-03T17:10:34.954753".