I've noticed that I get "improper statement" errors with unhelpful line numbers.

E.g. try compiling some code like this:

2. //send out editorial writer emails
3. for each booking in input.Edition_Bookings
4. {
5. //check whether an email has already been sent to this writer
6. writer_obj = Editorial_Writer[ID == booking.Editorial_Writer];
7. writer_email_address=writer_obj.Email;
8. email_sent_to=booking.Email_sent_to_editor_email;
9. if(email_sent_to  !=  writer_email_address)
10. {
11. //either no email has been sent to any writer, or the editorial writer has been changed
12. //therefore send out email
13. booking.Email_sent_to_editor_email=writer_email_address;
14. //retrieve email template
15. template_HTML = Email_Template[Template_Name == "Editorial Writer Assignment"].Template_Content;
16. //replace shortcodes with variables
17. template_HTML = template_HTML.replaceAll("<writer name>",writer_obj.Name,false);
18. template_HTML = template_HTML.replaceAll("<Client Name>",booking.Advertiser_Name,false);
20. template_HTML = template_HTML.replaceAll("<Client Contact>",booking.Advertiser_Contact,false);
21. template_HTML = template_HTML.replaceAll("<Client Mobile>",booking.Advertiser_Phone,false);
22. template_HTML = template_HTML.replaceAll("<Client Email>",booking.Advertiser_Email,false);
23. template_HTML = template_HTML.replaceAll("<Publication Name>",booking.Publication_Name,false);
24. template_HTML = template_HTML.replaceAll("<Special Instructions>",booking.Special_Instruction,false);
25. template_HTML = template_HTML.replaceAll("<Copy in due date>",booking.Copy_Due,false);
26. template_HTML = template_HTML.replaceAll("<Photograph Required>",booking.Photograph_required,false);
27. template_HTML = template_HTML.replaceAll("<approximate word count>",booking.Approx_Word_Count,false);
29. sendmail
30. [
31. From : "molly@morningtonlife.com.au"
32. To : writer_email_address 
33. Subject : "Congrats! You've been selected to write an editorial for " + booking.Advertiser_Name 
34. Message : template_HTML
35. ];
36. }
37. }
38. 
    
39. //send out proof check email if new proof added
40. for each proof_upload_id in input.Proof_21
41. {
42. proof_upload = Proof_Upload[ID == proof_upload_id];
43. if (!proof_upload.Emailed_to_advertiser)
44. {
45. //get advertiser email
46. client_account_obj = zoho.crm.getRecordById(("Accounts"), input.Client_Account_ID);
47. advertiser_email = (client_account_obj).get("Email");
49. //retrieve email template
50. template_HTML = Email_Template[Template_Name == "Proof Check Email"].Template_Content;
51. //replace shortcodes with variables
52. template_HTML = template_HTML.replaceAll("<advertiser name>",input.Client_Account,false));
53. proof_link = "<a href='" + proof_upload.Dropbox_Link + "'>here</a>";
54. template_HTML = template_HTML.replaceAll("<proof link>",proof_link,false));
55. //get publication details
56. booking_obj = Edition_Booking[ID == proof_upload.Edition_Booking];
57. template_HTML = template_HTML.replaceAll("<publication name>",booking_obj.Publication_Name,false));
58. pub_date_obj = Publication_Date[ID == booking_obj.Publication_Date];
59. template_HTML = template_HTML.replaceAll("<publication date>",pub_date_obj.Publication_Date,false));
60. //add approve link using CSS button generator for format
61. approve_link = "<a href=\"https://creator.zoho.com/bigbangmedia/big-bang-media-p-l-advertising-agreement/view-embed/Approve_Proof/proof_id=" + proof_upload_id + "\" class=\"approve_proof_button\">Approve Proof</a>";
62. template_HTML = template_HTML.replaceAll("<approve link>",approve_link,false));
64. sendmail
65. [
66. From : "molly@morningtonlife.com.au"
67. To : advertiser_email
68. Subject : "Please give feedback on your updated proof for publication in " + booking_obj.Publication_Name
69. Message : template_HTML
70. ];
71. }
72. }

There is a bug with the replaceAll calls. They have two closing brackets )) instead of one. The error number should thus be on line 51. But it shows at line 39 at the start of a for statement.